re: I missed the quote. What did Obama say the US would to to Russia?

My question is why this is being framed as a US vs.Russia issue when the genesis of the entire crises is a split in Ukraine regarding whether to hitch their wagon to Russia or the EU?

Are the leaders of the EU and their heads of state hiding under their desks?

I find it very bizarre that the EU is seemingly staying out of something in which they are the primary player while the pressure to handle it is put on the US.