Russia has a permanent veto power in the UN Security Council, which is the highest authority within it. So, I think a strongly worded protest is about the best they’d be able to do.

The UN is largely incapable of taking action against the US, Britain, France, China or Russia. This was necessary to get the large post-WW2 powers to agree to it in the first place, and prevent it from falling apart as the League of Nations did.