President Donald Trump welcomed Ukrainian President Volodymyr Zelenskyy to the White House for a high-stakes meeting as the U.S. president pushed for a deal to end Moscow's war on its neighbor. A host of European leaders joined the pair.

Following President Trump’s recent meetings with Russian President Putin and Ukrainian President Zelenskyy, the White House says it’s optimistic that a meeting between the two warring leaders will soon happen. Despite that optimism, challenges remain ...