A band of moderate Republicans in Congress sharply criticized the Trump administration this week for siding with Russia at the United Nations on resolutions regarding the war in Ukraine, even as the majority of the G.O.P. turned a blind eye to the United States’ sudden embrace of a longtime adversary.“The Trump Administration royally screwed up today on Ukraine,” Representative Don Bacon, Republican of Nebraska, wrote on social media on Monday night. “The vast majority of Americans stand up for independence, freedom and free markets, and against the bully and invader.”The reproach from Mr. Bacon and others came after the United...