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.

Ukraine is benefiting from Donald Trump's frustration with Vladimir Putin, but his first six months in office show that no one knows if it will last.

Trump said he would end the war in Ukraine within his first 24 hours in office. His patience with Russia's Putin now appears to be wearing thin.

A bipartisan U.S. bill that would hit Russia with sanctions in a bid to pressure Moscow into good-faith peace negotiations with Ukraine has gained momentum this week in Congress, but it still lacks the presidential push it needs to get over the finish line.

A detailed timeline of events shows the White House was aware of an ordered pause in weapons to Ukraine in real time and Trump's decision to reverse the action.

President Donald Trump told NBC he struck a deal with NATO on Thursday for the US to send weapons to Ukraine through the alliance, and that NATO will pay for those weapons “a hundred percent.”

By Kanishka Singh, Frank Jack Daniel and Angelo Amante WASHINGTON/KYIV/ROME (Reuters) -U.S. President Donald Trump said on Thursday the United States would supply weapons to Ukraine via NATO and that he would make a "major statement" on Russia on Monday.

A new book alleges that President Donald Trump told donors he threatened Russian President Vladimir Putin with bombing Moscow if Russia invaded Ukraine.

The arrangement allows Ukraine to get weapons it needs in its war with Russia while providing a way for Europe to increase its defense spending as promised.

Former Vice President Mike Pence says he thinks isolationists “may have lost some of their footing” in President Donald Trump’s administration, as he praised Trump’s tougher talk toward Russia’s Vladimir Putin and his decision to bomb Iranian nuclear facilities.

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.