MICHAEL KIMMAGE is Professor of History at the Catholic University of America. He is the author of Collisions: The Origins of the War in Ukraine and the New Global Instability.

President Trump is hosting NATO Secretary General Mark Rutte at the White House on Monday as the U.S. agrees to sell new and more weapons to Europe and Ukraine.

NATO Secretary General Mark Rutte warned India, China, and Brazil of potential secondary sanctions if they continue trade with Russia. Rutte urged these nations to pressure Putin for peace talks.

NATO Secretary General Mark Rutte discusses President Donald Trump's decision to sell weapons to NATO for Ukraine in an interview on 'Special Report.'

President Donald Trump has softened his stance on NATO. He once called the Western alliance "obsolete." Now, he says, it's the "opposite of that."

NATO Secretary-General Mark Rutte is set to meet President Donald Trump this week on the heels of the U.S. leader announcing plans to sell NATO allies weaponry that they can then pass on to Ukraine.

President Donald Trump's recent about-face in his relationship with Russian President Vladimir Putin surprised many people in the White House, except for one. Trump hinted on Monday that first lady Melania Trump may have helped change his mind on Putin.

President Trump reveals how Russian leader 'talks nice, then bombs everybody' as the U.S. prepares to send Ukraine Patriot missiles under a NATO agreement.