Russia’s got nukes and reminded everybody about it just a few days ago.
Ukraine is basically on their own as they never joined NATO. They were back and forth about joining for years. The public support was low and they have been doing their own training since at least 2014 anyway.
There’s little question that Russia will probably get Ukraine in the end unless Ukraine puts up a tremendous fight.
But no, nobody’s coming to help. The other nations including the USA all made that clear. The Ukrainian regimes have been unstable and topsy-turvy and difficult to for NATO and EU to work with so any help is going to be sporadic.