Donald Trump and Vladimir Putin could take fresh approaches on contentious issues, including Russia’s meddling in U.S. elections, Ukraine, Syria, and arms control, to their meeting in Helsinki.

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…

Last week’s mail bombs and synagogue attack have reignited a heated discussion of hate crimes and terrorism in the United States. Definitions matter in this debate.

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.

President Trump is undermining his peace initiative with North Korea by abruptly raising the cost to South Korea for U.S. security.

The United States and Russia are at odds on so many issues that the upcoming summit could convince their two presidents to give up on better relations and accept estrangement.