With the Castro era coming to a close in Cuba, it may be time for President Donald J. Trump to take back some of his predecessor’s concessions to Havana.

Votes against Israel at the United Nations over the decades seem to indicate it is a pariah nation, but the country’s expanding bilateral ties tell a different story.

South Korea must capitalize on its diplomatic push to bridge the divide between its longtime ally and its combative neighbor.

President Trump’s much-anticipated Afghan policy rightly avoids troop withdrawal timelines but offers little prospect for progress against the durable Taliban.

A little-known treaty provides transparency for confirming arms control agreements and serves as an important measure of the health of the U.S.-Russia relationship.