Russia is doing what it wants. It took Crimea, made Belarus its puppet state, shot down a Malaysian passenger jet and blamed it on the Ukrainians, refused to give back Polish government plane that crashed in Smolensk, forced the US to cancel a deal with Poland that was supposed to place missile defense systems along its eastern border. Russian agents poisoned Sergei Skripal and his daughter, poisoned and then arrested Aleksiej Nawalny, Putin and Lavrov often threaten other countries and lie in public. Russian elections are known to be a joke and in one of them there was so many fraudulent votes for Putin that the sum of votes shown on TV was over 100%.

I'm fairly certain that if they invade Ukraine the UN, NATO and the EU will issue formal letters to Putin, maybe even call him, then do some reconnaissance flights, drop some aid packages, accept refugees and that's going to be it.