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.

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

US President Donald Trump gave a cryptic response to a Russian military strike on a maternity hospital in the city of Kharkiv, speaking to reporters while en route to Texas. While speaking to the press near the White House,

Any analysis of Donald Trump's current thinking on Russia risks getting out of date very quickly.Read too much into an individual tweet, post or off-the-cuff comment by the US president, and the danger is that your conclusions will be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

President Donald Trump called Russian President Vladimir Putin out for throwing “bullsh*t” on peace talks with Ukraine - hours later, Russia launched its largest ever drone attack on Ukraine. CNN’s Matthew Chance analyzes whether the US leader’s comments have an impact on Russia’s military operations.

A week ago today, Trump had an hourlong phone call with Russian President Vladimir Putin. And after that, everything changed. The end of the affair: The U.S. president — who in January came into office claiming he could strike a peace deal with Putin on Day One;

The truth is, he believed me 10%,' Trump said of the threat he made to Putin that he would bomb Moscow if Russia invaded Ukraine.