Most of the world's nuclear-armed states continued to modernize their arsenals last year, setting the stage for a new nuclear arms race, researchers warned Monday.
The Stockholm International Peace Research Institute (SIPRI) said nuclear powers including the United States and Russia — which account for around 90% of the world's stockpile — had spent time last year "upgrading existing weapons and adding newer versions."
Since the end of the Cold War, old warheads have generally been dismantled quicker than new ones have been deployed, resulting in a decrease in the overall number of warheads.
With your current subscription plan you can comment on stories. However, before writing your first comment, please create a display name in the Profile section of your subscriber account page.