On more than 30 occasions, the United Nations Assembly has discussed the blockade against Cuba, which costs the island 5 billion dollars annually, according to some estimates. Every year the resolution is proposed and the whole world, through the vote of the absolute majority of the member countries of the United Nations General Assembly, has condemned the imperialist attitude of the United States towards Cuba.
There are two tiers of UN. There’s the “I’m not a colonizer that’s willing to nuke people” tier, where the strongest outcome is “sternly worded email”; and then there’s the UN Permanent Security Council tier where you get an absolute veto power that cannot be questioned. The wiki is a very educating read
Edit: please tell me what part I am incorrect about if you disagree so hard that you downvote me out of the discussion.