News of Iran’s upcoming release of U.S. nationals and the unfreezing of Iranian assets has stirred speculation of a new nuclear deal. But there are many obstacles to such a breakthrough.

A devastating power crisis is plaguing South Africa, battering its economy and threatening to sink its climate goals amid the global race to renewables.

Moscow’s exit from the deal generated alarm in a number of populous lower-income countries dependent on Ukrainian grain.

If Western allies fail to send Ukraine the weapons it needs, the odds increase of the war dragging on indefinitely, at a terrible cost to both Ukraine and Russia and a growing risk to the wider world…

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. …

Washington and Tehran seem determined to revive the deal that freezes Iran’s nuclear program, despite domestic criticism on both sides and the apparent sabotage of an Iranian facility.