Why do you think they dismantled all those washing machines?

This is a bit further than sane. I think you’ve got the idea from Russian marauders stealing washing machines. They were just marauders.

But yes, and not even Soviet, but relatively new things may not require too advanced chips.

I think a lot of that works on TTL logic and relays frankly. And not even only in Russia. While NATO countries had access to a much easier supply of chips, reliability is a factor too in military tech. Keep it simple, stupid, and all that.