Russian President Vladimir Putin signed a revised nuclear doctrine on Tuesday that says any attack on Russia by a nuclear-powered country could be grounds for a nuclear response.

Putin signed the new policy on the 1,000th day of the war with Ukraine and the day after President Biden authorized Ukraine to use longer-range US-supplied missiles to strike inside Russia.

The doctrine also says Russia could respond to aggression against its ally Belarus with nuclear weapons, the Associated Press reported.

Although the doctrine does not specify that Russia will definitely respond to such a thing nuclear weapons attacks, it mentions “the uncertainty of the extent, timing, and place of possible use of nuclear deterrence” as key principles of deterrence.

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Russian President Vladimir Putin signed a revised doctrine stating that an attack on Russia by a nuclear-powered country could trigger a nuclear response during a Nov. 18 meeting at the Moscow Kremlin. (Vyacheslav Prokofyev, Sputnik, Kremlin Pool Photo via AP)

Asked if the updated doctrine comes in response to Biden’s decision to ease restrictions on how Ukraine can strike Russia, Kremlin spokesman Dmitry Peskov told the AP that the doctrine was released “in a timely manner.”

Peskov also said that Putin told the government to update it earlier this year so that it was “in line with the current situation” – the Russian president led a meeting in September to discuss these proposed revisions to the doctrine.

The Kremlin said the review was released “in a timely manner” when asked if it was done in response to President Biden authorizing Ukraine to use long-range US missiles in Russia. (REUTERS/Kevin Lamarque)

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Unveiled in September, the doctrine now officially states that year attack on Russia by a non-nuclear power with the “participation or support of a nuclear power” will be regarded as a “joint attack on the Russian Federation”.

A Yars intercontinental ballistic missile is test-launched from the Plesetsk launch pad in northwestern Russia in October 2024. (Press service of the Russian Ministry of Defense via AP)

It also contains a wider range of conditions that would trigger the use of nuclear weapons, noting that they could be used in response to an air attack involving ballistic and cruise missiles, aircraft, drones and other flying vehicles.

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The previous document threatened to use Russia’s arsenal if “reliable information is received about the launch of ballistic missiles aimed at the territory of Russia or its allies.”

The Associated Press contributed to this report.