Trump announces Patriot missile aid for Ukraine and signals possible sanctions on Russia amid fresh NATO talks and mounting pressure on Putin.

The legislation, which would allow the president to levy a 500% tariff on imports from countries that purchase Russian uranium, gas and oil, has gained momentum in the Senate as Trump has signaled he will escalate US action against Russia.

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.

Poland and the Baltic states also withdrew from the Ottawa Convention despite pleas from some leaders to maintain decorum in the face of Russian aggression.

Poland on Saturday scrambled fighter jets in response to Russian military aircraft near its border with Ukraine.

President trump has escalated criticism of Vladimir Putin amid a barrage of attacks on Ukraine and has hinted at tougher sanctions against Russia.