Ukraine's future could hinge on a hastily assembled meeting Monday at the White House as President Volodymyr Zelenskyy brings an extraordinary group of European leaders to show U.S. President Donald Trump a united front against Russia.

Russia’s troops are continuing their slow war of attrition in eastern and northern Ukraine, even as the conflict enters a pivotal phase with a series of high-level meetings that are part of U.S. Pres...

But five critical issues for any peace deal are likely to be discussed: sequencing, territory, security guarantees, sanctions and recognition.