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.

Russia can't deal with small Ukraine for 4 years. Their outdated poor tech and drunkard band of villagers called "soldiers" can't defeat a country with 5 times less population. Even with the help of the equally poor and unqualified North Korea and the jihadists of Khadirov, Russia hasn't achieved anything substantial but lose north of a million poor conscripts.

I want to remind you Russia's long distance rockets have largely self destructed on Russian territory even without a liftoff: https://edition.cnn.com/2024/09/24/europe/russia-sarmat-miss...

A single misstep of the Russian war criminals on EU soil, and they will be obliterated in seconds. It's bonkers to think otherwise.