The United States and South Korea are reluctant to give North Korea a test that it might fail.

The Singapore summit lessened the chances of conflict in the short term, but the ultimate legacy of the summit could still be a march toward war.

If 2018 was a year marked by international challenges that percolated but did not boil over into full-blown crises, next year may well be the year in which that good fortune runs out.

In 2018, CFR once again hosted high-level discussions of global affairs, from U.S. election security to the Iran-Saudi Arabia rivalry to the artificial intelligence race.

While the United States has turned inward, focusing primarily on domestic challenges, history has not stopped.