MOSCOW, Sept 25 (Reuters) - President Vladimir Putin said on Wednesday that Russia could use nuclear weapons if it was attacked by any state and that any conventional attack on Russia that was supported by a nuclear power would be considered to be a joint attack.

Kremlin spokesman Dmitri Peskov said on Sunday that Moscow's revised nuclear weapons doctrine is needed because NATO infrastructure is approaching Russia's borders ever more closely. Peskov told Russian state television that Western powers are seeking victory over Russia through their arms deliveries to Ukraine.

In Russia, amendments to the nuclear doctrine have been prepared and will be legally formalized in the near future, Kremlin spokesman Dmitry Peskov stated. He emphasized that the evolving situation in Ukraine necessitated a change in the doctrine.

By Mark Galeotti director of consultancy Mayak Intelligence and honorary professor at UCL School of Slavonic & East European Studies Vladimir Putin is at it again, playing on Western nerves with talk of modifications to Russia's nuclear doctrine to open up more options for their use.

In recent months, Vladimir Putin and his proxies have been foreshadowing a change in Russias nuclear doctrine. This is the set of rules that spells out when and how his country might resort to the use of its

Nuclear doctrine specifies how countries with atomic weapons intend to use their arsenal. Restrictions on the use of nuclear weapons make it difficult for Vladimir Putin to treat them as a useful deterrent.