News Analysis On Wednesday evening, Russian President Vladimir Putin ordered his troops to begin an invasion of Ukraine. The invasion and the tensions leading up to it have put on full display divisions between the old guard of the Republican Party, who have called for a major U.S. response, and the new populist wing of the party, who have called for the United States to stay out of the conflict. Prior to President Donald Trump’s 2016 campaign, Republicans were largely in favor of the United States’ role as an international peace-keeping force. Republicans largely supported several conflicts begun after the collapse of the Soviet Union, including the military action to repel Iraqi forces from Kuwait in 1991, the larger-scale invasion of Iraq in 2003 that ended in the execution of Saddam Hussein, and the Afghanistan War. In 2016, Trump sparked a new brand of right-wing populism that, in contrast to the GOP of the …