President Trump will host a signing ceremony tomorrow at the White House for a peace agreement between Armenia and Azerbaijan, alongside the leaders of those countries.

The big picture: The deal is one of Trump's most significant foreign policy achievements so far and could help end one of the world's longest-running conflicts. • It's another chance for Trump — who described Friday's gathering as a "Historic Peace Summit" — to portray himself as the global peacemaker-in-chief. • He's previously heralded diplomatic breakthroughs between Rwanda and the Democratic Republic of Congo, India and Pakistan, and most recently Cambodia and Thailand — even as peace in Ukraine and Gaza proves elusive.

Zoom in: Armenia and Azerbaijan have fought a series of cross-border conflicts since the late 1

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