Russian President Vladimir Putin is set to travel to the Middle East this week, a rare trip abroad intended to signal that the protracted and costly war in Ukraine hasn’t diminished Moscow’s place on the world stage. In only his second trip outside Russia since the country invaded Ukraine in February, Mr. Putin is set to travel to Tehran on Tuesday, where he will meet Turkish President Recep Tayyip Erdogan and Iranian President Ebrahim Raisi. The visit reflects the importance Mr. Putin places in maintaining the leverage Russia gained from years of military and diplomatic intervention in the Middle East.