Russian President Vladimir Putin on Tuesday signed a revised nuclear doctrine declaring that a conventional attack on Russia by any nation that is supported by a nuclear power will be considered a joint attack on his country. Putin's endorsement of the new nuclear deterrent policy comes on the 1,000th day after he sent troops into Ukraine on Feb 24, 2022. It follows US President Joe Biden's decision to let Ukraine strike targets inside Russia with US-supplied longer-range missiles.

The signing of the doctrine, which says that any massive aerial attack on Russia could trigger a nuclear response, reflects Putin's readiness to threaten use of the country's nuclear arsenal to force the West to back down as Moscow presses a slow-moving offensive in Ukraine. Asked about whether the updated doctrine was deliberately issued on the heels of the US' decision to ease restrictions on Ukraine using its longer-range missiles to strike Russia, Kremlin spokesperson Dmitry Peskov said the document was published “in a timely manner” and that Putin instructed the government to update it earlier this year so that it is “in line with the current situation”. Putin first announced changes in the nuclear doctrine in September, when he chaired a meeting discussing the proposed revisions.

The new version of the document states that an attack against his country by a nonnuclear power with the “participation or support of a nuclear power” will be seen as their “joint attack on the Russian .