China expanded its nuclear warhead stockpile over the past year and might have increased the number deployed with operational forces, a Swedish think tank report said, warning that major powers were “walking away” from disarmament commitments. According to the report released on Monday as part of the Stockholm International Peace Research Institute’s (SIPRI) latest yearbook, China added 20 warheads to its nuclear stockpile as of January 2026, bringing the total to 620, up from 600 a year...