Largest nuke arsenal that they could find even one in, that they would be sure enough it works to detonate even on their own vast wasteland as the show of force?

Ask yourself why despite ample amount of scaremongering russia didn't detonate even one, just for show? If they tried and failed they'd demonstrate weakness.

And rockets? All they could demonstrate in 3 years was a single stripped down monkey patched small sort of ICBM and even that after making some very nice crater in russia on previous attempted launch.

Might of russia is mostly American PR stuck from the times of cold war.