Russian officials have threatened that a possible decision by the West to allow Kyiv to use donated weapons to strike deeper into Russian territory would result in a major escalation of its war against Ukraine that could include the use of nuclear weapons.

Former Russian President Dmitry Medvedev, now deputy chairman of Russia’s Security Council, warned on September 14 that Kyiv could be turned into a “gray melted spot” if restrictions against Ukraine’s use of Western weapons were loosened.