Ukraine’s leader, Volodymyr Zelensky, traveled east to visit frontline troops trying to stave off Russian attacks, and invited reporters for The New York Times to go with him. President Volodymyr Zelensky, with tired eyes, deep worry lines and a beard flecked with gray, boarded a train on Thursday night in Kyiv to visit his troops in eastern Ukraine, where the fighting has been fiercest. It seemed a lonely journey. The U.S... [1015 chars]