Alexey Filatov: "The Unseeing Eye"

“Another problem with the operation of satellites of the 71X6 type is their overall low reliability. Given the estimated active life of satellites of the type in question for five to seven years, only two of the eight satellites launched since 1991 were able to stay in orbit for more than five years. That’s the savings on reliability led to the fact that durable products (and of strategic importance) began to turn into disposable products. And then, if you’re lucky, multiple crashes of launch vehicles at the start are clear evidence of this.

Thus, domestic traditions of reliability, when the actual service life of satellites many times exceeded the declared one, have been lost."