President Donald Trump seems to have learned the lesson painfully gleaned by all his 21st-century predecessors: You can’t reset US relations with Vladimir Putin.

Trump’s decision to help Ukraine fight an onslaught of Russian attacks reverses a Pentagon decision to withhold defensive weapons.

President Donald Trump on Friday issued a none-too-veiled threat of action against Russia after Moscow’s forces hit a Ukrainian maternity hospital, injuring nine people earlier in the day.Speaking to reporters before departing the White House to view flood damage in Texas,

Republican defense hawks are riding high after a series of events abroad prompted President Donald Trump to lean away from his more quasi-isolationist roots in his first term. His bombing of Iran, increased aggression toward Russia,

Trump said at a Cabinet meeting that he was "not happy" with Putin, who he forcefully criticized for a second day in a row.

Russian President Vladimir Putin’s forces launched a massive aerial assault on Ukraine early Thursday for the second time in two days.

President Trump announces arrangement where NATO pays for US weapons sent to Ukraine, as Russian strikes intensify across Ukraine, including an attack on a maternity hospital.

Any analysis of Donald Trump's current thinking on Russia risks getting out of date very quickly.Read too much into an individual tweet, post or off-the-cuff comment by the US president, and the danger is that your conclusions will be contradicted by tomorrow's tweet,