China has increased its nuclear weapons by about 10 warheads in the past year, and other nuclear states appear set on maintaining their arsenals, a Swedish think tank said on Monday. At the start of the year, China had raised its number of nuclear warheads to 250 from 240 in 2012 as part of a process to modernize its defense, the Stockholm International Peace Research Institute said. However, it also said China is “highly non-transparent” when it comes to its nuclear arsenal. Bitter rivals Pakistan and India also increased their arsenals by around 10 warheads each. Meanwhile, the US and Russia continued their disarmament in accordance with the new START treaty that they signed in 2010.—AP