At the end of July, the front page of Ukraine’s English-language newspaper The Kyiv Post read: “Betrayal. Global powers U.S. and Germany turn their backs on Ukraine and undermine European security as they strike a deal allowing the completion of Nord Stream 2, Russia’s controversial gas pipeline project.” The publication declared Angela Merkel Ukraine’s foe of the week and Joe Biden “a close second.” The shift was abrupt. Biden has long been considered Ukraine’s “big friend,” with Brian Bonner, the editor of The Kyiv Post, saying that prior to the 2020 U.S. elections, Ukrainians were “holding their breath and hoping...