It is generally accepted that the USSR/Russia is more iterative in weapons development, while trying crazy one offs now and again (high speed, high depth, double-hull titanium submarines, supercavitating torpedoes, plasma stealth, 3D-thrust-vectoring on fighters, PESA radar on the MIG31, etc, etc). They keep what sticks, for example high off-bore, helmet queued IR-missile targeting on the MIG-29 (it took a while for the US AIM-9 to catch up), but go for the cheaper versions on everything else.
While it is a budgetary necessity now, it simply "worked" in the past.
The same can't really be said for their rockets though, Musk is going to "crush them" to quote our friend Khruschev, and then Russia has no technological lead left, at all. Maybe niches in cybersecurity and new nuclear power generators, but that seems to be about it. Tragic really.