Putin approves revision of 'nuclear doctrine'... to be used even for non-nuclear states supported by nuclear states.

Russian President Putin has approved a revision of Russia's nuclear doctrine that includes the principle of using nuclear weapons, with the United States allowing the use of long-range missiles to strike the Russian mainland.

The Russian government has officially announced that Putin has signed a new nuclear doctrine.

Accordingly, even countries that do not possess nuclear weapons are included in the target of nuclear weapons if they attack Russia with the support of nuclear powers.

Earlier, at a national security meeting in September, Putin said, "The policy in the field of nuclear deterrence should be adjusted to suit reality," signaling an expansion of the scope of nuclear weapons use.

Russian Foreign Ministry spokesman Mariya Zakharova also warned that allowing U.S. long-range missile strikes would mean direct involvement in the conflict and that "Russia's response would be appropriate and obvious."