President Donald Trump’s ultimatum to Russia to accept a peace deal in Ukraine within 50 days or face bruising sanctions on its energy exports has given the Kremlin extra time to pursue its summer offensive.

President Donald Trump has finally found a way to like arming Ukraine: ask European allies to donate their weapons, and sell them American replacements.

As President Donald Trump hardens his position toward Moscow and seeks new ways to bring the conflict to an end, he is leaving open the prospect of allowing shipments of longer-range missiles to the country that would allow it to strike deeper into Russia,

The president’s call for Ukraine to avoid hitting Moscow continued his pattern of swinging between pressure on both sides to end the war and underscored the uncertainties about his strategy.

Ukraine will get its first new prime minister of the war on Thursday, as President Volodymyr Zelenskiy tries to wrestle wartime defence spending into shape and win over both Donald Trump and a war-weary public with fresh-faced leadership.

President Trump has effectively handed Vladimir Putin an extraordinary green light: 50 days to finish off his brutal summer offensive in Ukraine before facing any consequences.

A new plan to funnel billions in "top of the line" weapons is his most forceful backing of Ukraine yet, writes Daniel Fried.

President Donald Trump announced this week that the U.S. will send Patriot air-defense missiles to Ukraine and threatened new tariffs on Russia. 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: