Russian President Putin last month proclaimed that the territories Moscow was taking from Ukraine would be part of Russia "for ever". But Russia does not wholly control any of the four regions and has yet to define their borders.
North Korea could have around 60 nuclear weapons, according to analysts.
According to a report by Stockholm International Peace Research Institute (SIPRI), the combined military stockpile of the world's nine nuclear-armed states rose from 9,380 to 9,620 in one year, excluding the warheads waiting to be dismantled.
Iran’s President Hassan Rouhani says Tehran has decided on starting advanced centrifuges and refined uranium to make Israel understand it cannot stop the country from using nuclear technology.
Russian diplomat participating in talks to save 2015 JCPOA accord says meeting in Vienna has been "successful," though salvage efforts will take time.
Secretary of State Antony Blinken told European allies that the US is prepared to talk to Iran about both countries returning to compliance with a 2015 deal that aims to stop Tehran from developing a nuclear weapon.
Worldwide food shortages and mass starvation will follow the deaths as Earth enters a new period of cooling, with temperatures not seen since the last Ice Age, researchers in a new paper say.
A senior Trump administration official, speaking on condition of anonymity says Washington was not prepared to say at this point whether it was a nuclear explosion but believed it did involve radioactive elements.
Hiroshima is stepping up efforts to keep the memories of the calamity alive, as the survivors of the bombing, known as hibakusha, get older.
US President Donald Trump accuses Russia of violating the 31-year-old nuclear weapons agreement which prohibits Washington and Moscow from possessing, producing or test-flying a ground-launched cruise missile with a range of 300 to 3,400 miles.
What will it take for France to take responsibility for its extensive nuclear testing across its colonies and what are the effects of the radioactive legacy they left behind?
Japanese PM Shinzo Abe, whose government has chosen not to participate in the UN Treaty on the Prohibition of Nuclear Weapons ,said at the official ceremony his country's responsibility was to bridge the gap between nuclear and non-nuclear nations.
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