It's important to remember that not only is Putin a Paper Tiger militarily he is also a paper tiger economically.  Russia's economy is only half that of the state of California.
When Turkey shot down a Russian plane Putin talked big (remember that?) But did nothing. NOTHING.

He huffs and puffs over Syria but he won't do anything more than huff and puff.

Worse again for him is the fact that Russia's economy is actually in serious decline and is built on Energy a stable that other countries are learning to get from renewable sources.

Trump has shown Putin to be an even bigger bluffer than he is.

That's praise from Caesar!