I don’t think the US blew up Nord Stream. There’s a Ukrainian man in Poland who is wanted in Germany for blowing up Nord Stream. But a Polish judge refused to extradite the Ukrainian man to Germany because he thought a Ukrainian attack on Nord Stream would have been a justified response to Russia’s “bloody and genocidal attack” on Ukraine:

If Ukraine and its special forces… organised an armed mission to destroy enemy pipelines – which the court does not prejudge – then these actions were not unlawful… On the contrary, they were justified, rational and just

As for your claim of a “coup”, I don’t think that can be considered true in any way. Ukraine’s parliament voted to remove Viktor Yanukovych from the presidency. That’s democracy at work.