President Donald Trump said after a two-hour call with Vladimir Putin that peace talks would begin “immediately” after his Russian counterpart refused to attend negotiations May 15 with Ukrainian President Volodymyr Zelenskyy.

Ukraine will ask the EU next week to consider big new steps to isolate Moscow, including seizing Russian assets and bringing in sanctions for some buyers of Russian oil, as U.S. President Donald Trump...

If Mr. Trump keeps the two issues intertwined, it could confine Russia to an economic purgatory, with little immediate chance of getting relief from Western sanctions or of bringing the foreign inves...