United States President Donald Trump expressed on Thursday his disappointment with Russian President Vladimir Putin, regarding the lack of progress toward resolving the war in Ukraine. "With all of the heavy bombardment over the last two weeks, they have gained almost no land. I'm not going to ever call anybody a paper tiger but Russia has spent millions and millions of dollars in bombs, missiles, ammunition and lives," Trump told journalists amid a bilateral meeting with Turkish President Recep Tayyip Erdogan at the Oval Office.