 Biden threat of Putin using nuclear weapons is real US president Joe Biden has said that the threat of Russian president Vladimir Putin Using tactical nuclear weapons is real Biden said it in a conversation with a group of donors in California The US president has stressed that he is concerned about Putin's possible use of nuclear weapons When I was out here about two years ago saying I worried about the Colorado River drying up Everyone looked at me like I was crazy. They looked at me like when I said I worry about Putin using tactical nuclear weapons It's real he added before this Biden called Putin's announcement that Russia had deployed its first tactical nuclear weapons to Belarus Absolutely irresponsible last week Belarusian president Alexander Lukashenko said his country has started taking Delivery of Russian tactical nuclear weapons some of which he said were three times more powerful than the atomic bombs The US dropped on Hiroshima and Nagasaki in 1945 The deployment is Russia's first move of such warheads shorter range less powerful nuclear weapons That could be used on the battlefield outside Russia since the fall of the Soviet Union Ukraine's ambassador to the United Kingdom Vadim Prystyko Nevertheless said that Russia's nuclear threat should be taken very seriously Russia has just under 6000 nuclear weapons the world's largest nuclear arsenal and can launch its nuclear weapons from land-based missiles From submarines or from planes