The U.S. withdrawal from Syria removes the main obstacle to a Turkish campaign to eradicate Syrian Kurdish forces and could lead to a more dangerous phase of Syria’s civil war.

A collapse of this Cold War–era INF treaty, which many believe has favored the United States, could unleash a new age of nuclear weapons competition with Russia.

The staying power of Nicolas Maduro’s embattled government may hinge on three critical allies: Russia, China, and Cuba.

Congress is considering a bill that could punish countries for artificially boosting oil prices. What could that mean for warming ties between Russia and Saudi Arabia?

Ukraine’s presidential campaign—the first since the upheavals of 2014—is drawing to a close, and the most improbable of candidates has taken the lead. Could he really become the country’s next presid…