Obviously the US should take the lead getting rid of them. Most of them are admitted to be worthless, just kept alive because of congresspeople from Wyoming/Montana etc. demanding they stay open as pork.
But, here, the blame is entirely with Putin.
The "pork" component is interesting if modernizing our nukes creates any novel ideas or tech. Beyond that, it's Putin's fault. I just hope if we have more militarism, we can do it in a way that unites our allies. In fact, this can probably be achieved by just not doing what Bush did and simply stop fighting wars before there's actually a war.