Dmitry Medvedev

"Russia will have to use any type of weapon, including non-strategic nuclear weapons, against targets in Ukraine that pose a threat to our country."

"This is a direct transfer of nuclear weapons to a country at war."

"There cannot be a shred of doubt that in this case, Russia would have to use all weapons, including non-strategic nuclear ones, to strike targets in Ukraine that pose a threat to our country."

"This is the proportional response that Russia has the right to."