STOCKHOLM, June 9 — Researchers warned on Monday that nuclear-armed states were taking their arms out of storage and putting them on delivery systems, as the weapons of mass...

Governments are increasingly turning to nuclear deterrence. As the global arms buildup intensifies, so do the risks, the Stockholm International Peace Research Institute warns.

The world’s nuclear-armed states are increasingly moving warheads from storage onto operational delivery systems, raising the risk of conflict despite a gradual decline in overall…