https://morningstaronline.co.uk/article/russias-putin-lowers-threshold-use-its-nuclear-weapons

The threshold for Russia’s use of nuclear weapons was formally lowered by President Vladimir Putin today. [19 Nov 2024]
This followed a decision by US President Joe Biden to let Ukraine strike targets inside Russian territory with longer-range missiles supplied by Washington.
The updated doctrine says an attack against Russia by a non-nuclear-armed power with the “participation or support of a nuclear power” will be seen as their “joint attack on the Russian Federation.”
It warns that any massive aerial attack on Russia could trigger a nuclear response but avoids any firm commitment and mentions the “uncertainty of scale, time and place of possible use of nuclear deterrent.”
…
https://morningstaronline.co.uk/article/russias-putin-lowers-threshold-use-its-nuclear-weapons