The Ukraine Mess

So there's reports and images all over the news stating that Russian forces are/have entering the Ukraine en masse.

 
This one shows a unit of 2S1 Gvozdika self propelled artillery allegedly in-country.


Others show convoys of BTR's and masked troops.

So what is the US going to do.  I'm thinking about the same as when Russian invaded Georgia and slapped them around for awhile.  IOW nothing.   What's the world going to do?  I'm thinking the same thing.