Russia may use nuclear weapons, says Medvedev 

Russia is ready to use all types of weapons, including nuclear weapons, if it feels threatened, Dmitry Medvedev, the Deputy Chairman of the Security Council of the Russian Federation, said, Report informs, citing TASS.

He said this is in line with security doctrines: "If Kyiv attacks Crimea or other region of Russia, anything can happen as a response. This retaliatory measure will be swift, tough, and convincing."

Medvedev also said that there will be no negotiations if Ukraine strikes Crimea.