The short-lived Wagner Group revolt highlighted for Europeans the fragility of Vladimir Putin’s regime and their own vulnerability to an unstable Russia.

NATO will strengthen its partnership with Ukraine at its upcoming Vilnius summit, but the failed coup in Russia could add to divisions over membership.

The United States and South Korea should pursue an expanded nuclear agreement that supports the production of civilian nuclear power and enhances extended deterrence against the North Korean threat. …

The UN climate summit delivered on a loss and damage fund, but it fell short on goals to reduce emissions and avoid the worst consequences of climate change.

Countries made big pledges at last year’s UN climate conference, but greenhouse gas emissions continue to rise. This year’s event in Sharm el-Sheikh will focus on translating those commitments into a…