U.S. President Donald Trump's Ukraine envoy Keith Kellogg began talks in Kyiv on Monday on security and sanctions against Russia. That's a day after the U.S. president said he would send Patriot air defence missiles to Ukraine.

The president has become increasingly exasperated with Vladimir Putin and has repeatedly laid into the Russian leader for prolonging the Ukraine war.

Trump will meet with NATO's secretary-general to discuss the Russia-Ukraine war as his frustrations grow over the conflict. And, the president says the European Union and Mexico will face 30% tariffs.