India and Pakistan, the two South Asian nuclear giants, are increasing their nuclear weapon stockpiles and missile delivery capabilities even as across the world the reduction in nuclear weapons remains slow, an international think - tank said on Monday.
The two countries were estimated to have increased their nuclear warheads with Pakistan slightly ahead of India.
At the start of 2016 Pakistan had 110 - 130 warheads while India was behind with 100 - 120, the Stockholm International Peace Research Institute (SIPRI) said.
The world's biggest nuclear powers, the US and Russia, are slowly reducing their nuclear arsenals but are modernising their capacities, it said.
Nine states - the US, Russia, Britain, France, China, India, Pakistan, Israel and North Korea - had 15, 395 nuclear warheads at the start of 2016, including 4, 120 which were operationally deployed, the institutes's annual report said.
At the beginning of 2015, the number was 15, 850.
"Global nuclear weapon inventories have been declining since they peaked at nearly 70, 000 nuclear warheads in the mid - 1980s.
The decline has been due primarily to cuts made in the Russian and US nuclear forces, " researchers Shannon Kile and Hans Kristensen wrote in the report.
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The reductions are the result of three arms limitation treaties signed since 1991, as well as unilateral force reductions by the world's two nuclear superpowers.
"However, the pace of their reductions appears to be slowing compared with a decade ago, and neither Russia nor the USÂ… has made significant reductions in its deployed strategic nuclear forces since the bilateral New START treaty" entered into force in 2011, SIPRI said.
Russia was estimated to have 7, 290 nuclear warheads at the start of 2016, and the US 7, 000, with the two countries accounting for 93 percent of nuclear weapons in the world, it said.
They were followed by France (300), China (260), Britain (215), Pakistan (110 - 130), India (100 - 120), Israel (80) and North Korea (10), a reclusive country for which the data is uncertain and therefore not included in the overall totals.
"None of the nuclear weapon - possessing states are prepared to give up their nuclear arsenals for the foreseeable future, " SIPRI said, noting that Washington and Moscow have "extensive and expensive nuclear modernisation programmes under way. "
SIPRI concluded that worldwide, "the prospects for genuine progress towards nuclear disarmament remain gloomy".
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