We will get them Patriots, which they desperately need.” With these words, President Donald Trump signaled not just a reversal in his administration’s Ukraine policy, but a pivotal moment for the future of transatlantic security and the architecture of modern warfare.

Trump's shift from betraying Ukraine to turning on Putin reveals a lot about the man and his Presidency, argues George Llewelyn

While Trump's new Russia policy announcement was welcomed by and large, there are still challenges ahead that will require more from America.

While the US president's shift in tone on both Ukraine and Russia is huge, we need to remember that he can let deadlines slip and flip-flop repeatedly, writes Sky's Mark Stone.

Donald Trump privately urged Ukraine to strike targets deep inside Russia, including Moscow, if supplied with advanced US weapons, signalling a pivotal policy shift in the war and raising stakes for Nato and Kremlin escalation.

Will Vladimir Putin back down? What should Trump's next move be? And what does the future hold for Ukraine? Newsweek contributors Daniel R. DePetris and Dan Perry debate: Daniel R