Sri Lanka, April 27 -- U.S. President Donald Trump has cast doubt on Russian President Vladimir Putin's sincerity on ending the war in Ukraine, following a meeting with Ukrainian President Volodymyr Zelensky.The two met on the sidelines of Pope Francis's funeral in Rome.In a social media post after leaving Rome, Trump expressed concern that Putin might be "tapping me along" after Moscow's recent strikes on Kyiv, saying that there was "no reason for Putin to be shooting missiles into civilian areas."Earlier in the day, Trump and Zelensky were photographed while engaged in a discussion inside St. Peter's Basilica, just before the funeral service commenced.The White House described the 15-minute meeting between the two leaders as "very produ...