Corridor of Opportunity: Ukrainian mid-range strikes threaten the main achievement of Russian occupation – the land corridor to Crimea

The drastic increase in the scale and effectiveness of Ukraine’s drone warfare threatens to jeopardise one of the main strategic and symbolic achievements of the Russian invasion: the land corridor to Crimea.

The creation of this corridor was one of the strategic objectives of the Russian invasion. Ukraine’s naval blockade of Crimea demonstrated the inadequacy of its ‘return’ and left unresolved the question of its long-term development and full integration. The land corridor was intended to complete and consolidate Russia’s hold over Crimea and its control of the Sea of Azov and much of the Black Sea.

In recent years, Russia has devoted substantial resources to building the transport infrastructure of the land corridor, intended to bind together the territory of Russia, the occupied territories in southern Ukraine and the annexed peninsula into a single integrated space. In addition, this infrastructure became an important component of Russian military supply routes.

Severing the corridor was the principal objective of Ukraine’s unsuccessful 2023 counteroffensive. Today, the Ukrainian Armed Forces appear to be on the verge of another attempt against the corridor, this time from the air. Since the beginning of May, Ukrainian drones have increasingly targeted sites along the main routes of the land corridor, as well as Russian air defence systems protecting both the corridor and Crimea, while also appearing on the outskirts of Mariupol.

The expansion of Ukraine’s drone war, which has become the defining military development of recent months and is reshaping the balance of forces, including on the ground, may now acquire another strategic and symbolic dimension, becoming headlines and a further sign of Ukraine’s asymmetric counteroffensive from the air.

A strategic trophy of the invasion

The land corridor to Crimea, linking the peninsula to the territory of the Russian Federation, was effectively ‘cleared’ by Russian forces in March 2022, only weeks after the start of the war. The resistance of Mariupol, left behind Russian lines, was crushed through the total bombardment of the city, while the final bastion of Ukrainian defence, the Azovstal plant, fell in May. The creation of this corridor was certainly not the only, and perhaps not even the principal, motive for the 2022 invasion, but it was unquestionably among its most important objectives. The occupation of Ukraine’s Azov coast was evidently far better prepared than the ultimately unsuccessful ‘march on Kyiv’.

The annexation of Crimea in 2014 left fundamental issues regarding the integration and life support of the captured territory unresolved. The Crimean Bridge addressed these issues only partially, while the critical question of the peninsula’s water supply became increasingly acute with each passing year. The North Crimean Canal, which had supplied 85% of Crimea’s water by linking the peninsula to the Dnipro and sustaining its agricultural sector, was blocked by Ukraine in April 2014. Since then, the Russian authorities have failed to find an alternative solution. As a result, Crimean agriculture has undergone irreversible decline, with irrigated land shrinking from 120,000–130,000 hectares to just 14,000 hectares. Even the creation of a fully functioning resort zone along the southern coast remained under constant threat. During the drought years of 2020–2021, Crimea introduced water rationing and scheduled access to fresh water. Consequently, the ‘return of Crimea’, as Putin’s central political project, appeared strategically incomplete without resolving the question of the land corridor.

In turn, the rapid seizure of Ukraine’s Azov region, as Paul Goble, a former CIA and State Department analyst, wrote in 2022, allowed Moscow to achieve three geopolitical objectives: resolving Crimea’s water supply problem, substantially improving transport connectivity between Russia, the Azov coast and Crimea, and effectively turning the Sea of Azov into an internal body of water. In practice, however, the ‘water’ objective proved illusory. Following the destruction of the Kakhovka dam in 2023 and the subsequent fall in water levels in the Kakhovka reservoir, the North Crimean Canal once again became shallow, and the water supply problem may now be even less solvable than before. The restoration of the dam is expected to take years. Nevertheless, the land corridor to Crimea remains the principal trophy of Russia’s occupation and is regarded as a critical logistical artery for sustaining the occupied Ukrainian territories. Symbolically and politically, the ‘corridor to Crimea’ is arguably an even more significant success for Putin in this war than the conquest of the Donbas.

The Azov Ring and the deep military rear

The Russian authorities began developing the corridor’s road infrastructure as early as 2022 as part of a large-scale programme to restore and integrate the occupied territories. In September 2025, Putin stated that Russia had built 6,350 km of roads across the ‘liberated’ territories over three years. This figure is almost certainly as detached from reality as the president’s repeated claims regarding supposedly captured and encircled Ukrainian settlements. Nevertheless, according to a Reuters investigation, Russia allocated approximately $12 billion between 2024 and 2026 for the development of the four occupied regions of Ukraine, with the overwhelming share directed towards transport infrastructure.

The transport corridor to Crimea consists of a network of overland supply lines running along the northern and western shores of the Sea of Azov, linking Rostov-on-Don with the occupied territories of Donbas and southern Ukraine, including Mariupol, Berdyansk, Melitopol and Henichesk, and from there to Crimea. Construction of the railway component of the corridor is being carried out by the state enterprise ‘Railways of Novorossiya’. The network, with a total length of approximately 525 km, includes the Rostov-on-Don–Taganrog–Mariupol line, the Mariupol–Berdyansk section, and the Berdyansk–Melitopol route connected to the Crimean rail network near Dzhankoi.

In March 2024, ‘Railways of Novorossiya’ reported that 63 km of track had already been built along the coastal section and a further 140 km repaired, whilst in April 2025, the Federal Agency for Railway Transport reported that the first container train had arrived in Crimea. However, the head of the Ukrainian Centre for the Study of the Occupation, Petro Andriushchenko, believes that the actual progress of railway construction has fallen far behind schedule and that no fully operational railway trunk line along the Azov coast yet exists. According to him, the occupation authorities have managed only to partially restore isolated sections of old track and establish fragmented freight connections.

The transport corridor also forms part of the broader Azov transport ring, which includes a motorway network of approximately 1,400 km linking Rostov-on-Don with Crimea on both sides of the Sea of Azov. A key component of the ring is the federal R-280 ‘Novorossiya’ federal highway from Rostov-on-Don to Simferopol (passing through Mariupol and Berdyansk, among other places). During a live broadcast on 19 December 2024, Putin announced that the 40 km section connecting Taganrog with Mariupol had already been completed and that all roads in the ‘new territories’ would be brought into line with ‘Russian standards’ within three years. In December 2025, the First Deputy Minister of Transport of the Russian Federation Konstantin Pashkov claimed that the R-280 federal highway had ‘been fully brought up to standard’. According to a post by an internet user apparently associated with the Telegram channel ‘Crimea – Tourist Hub’, by 2025 the road to Crimea through the occupied territories was allegedly already fully open to round-the-clock traffic, with around 10% of tourist flow to the peninsula passing through it.

In practice, the overland corridor through the occupied territories also plays a critical role in supplying Russian forces in Donbas and Zaporizhzhia. Following several attacks on the Crimean Bridge in 2023, Russia largely ceased using it for military logistics, as reported in 2024 by the Ukrainian OSINT project Molfar. Based on analysis of satellite imagery from May 2023 to April 2024, analysts concluded that military cargo movements across the bridge had completely ceased in 2024. In spring 2024, the head of the Security Service of Ukraine, Vasyl Maliuk, likewise stated that Russia had stopped using the Crimean Bridge for military purposes. By contrast, supply routes through the corridor remained relatively secure over substantial stretches and enabled the establishment of logistical bases for transferring equipment and ammunition to front-line positions.

The integration of the port infrastructure in Mariupol and Berdyansk has also become a key element of the Russian troops’ supply system, writes the Ukrainian Centre for Transport Strategies. The port of Mariupol still has ramps for unloading heavy wheeled and tracked vehicles, whilst the port of Berdyansk has become a fully-fledged military facility equipped with air defence systems and fortified shelters. The transport corridor is therefore an important component of Russia’s deep rear military infrastructure.

Asymmetric counteroffensive

An attempt to sever the land corridor, which is strategically significant for the entire Russia-Ukraine war, was the principal objective of Ukraine’s 2023 counteroffensive. That offensive, however, failed completely. Three years later, Ukraine appears ready to open a new front in its campaign against the corridor, this time from the air.

This development has been facilitated by the rapid expansion in the capabilities and striking power of Ukrainian mid-strikes, which in 2026 have become a central problem for Russia’s rear areas (→ Re:Russia: A War of Attrition in The Skies). On 8 May, the international anniversary marking the end of the Second World War, the 1st Corps of the Ukrainian National Guard ‘Azov’ announced that it was ‘returning to Mariupol’. In published videos, the corps’ drones are seen patrolling roads near the city. The use of US-made Hornet drones for reconnaissance and strikes on targets in Mariupol has also been confirmed by independent OSINT investigators. And, on 14 May, the director general of the Mariupol Drama Theatre, Igor Solonin, stated that he regularly heard the sound of Ukrainian strike drones flying over the theatre district and targeting Russian air defence systems.

A report by the Institute for the Study of War (ISW) summarises Ukrainian military reports concerning drone strikes on targets in occupied Azov territories. In early May, Ukrainian forces reportedly struck a truck on the T-0509 Mariupol–Donetsk highway, which is used to supply Russian troops participating in the offensive against the ‘fortress belt’ in northern Donbas, as well as targets along the M-14 Mariupol–Berdyansk–Melitopol route. According to ISW, this highway supports Russian logistics in the direction of Orikhiv in Zaporizhzhia and on the left bank of the Dnipro. In the institute’s assessment, Ukraine’s growing ability to strike deep within the enemy rear will reduce Russia’s capacity both to conduct future offensive operations and to defend itself in the event of a renewed Ukrainian counteroffensive.

However, there is as yet no evidence of the systematic destruction of Russian supply lines in the occupied territories. Nevertheless, pro-Russian military correspondents have already sounded the alarm. One of them noted that the highway over which Azov drones were filmed is used by lorries travelling to Crimea and the ‘special military operation zone’, transporting fuel and military equipment. The author of the Z-channel ‘Molot Ved’m’ fears that the Mariupol–Berdyansk highway could soon face the same situation as the M-30 Horlivka–Donetsk route, which has effectively been paralysed by Ukrainian drones and where civilian traffic is now prohibited.

The channel ‘Witnesses of Bayraktar’ linked these events to Russian forces losing control over low-altitude airspace, noting that ‘the enemy has identified our limited capabilities to intercept small UAVs, and now we are already seeing lorries burning near Mariupol’. One of the leading Russian pro-Kremlin military correspondents, ‘Rybar’, believes the attacks on Mariupol are yet another indication of the deteriorating situation for Russian forces in the Zaporizhzhia region. According to Rybar, the Ukrainian Armed Forces are increasingly striking logistics centres, including in the Melitopol area, and ‘the land route to Crimea is becoming increasingly dangerous’.

The expansion of Ukraine’s drone war, which has become the defining military development of recent months and is reshaping the balance of forces, including on the ground, is therefore acquiring an additional strategic and symbolic dimension that is likely to make headlines in the near future.