Russian President Vladimir Putin has approved changes formally lowering the threshold at which his country can consider a nuclear attack.

A decree signed by the Russian leader, though long planned, came days after President Biden authorized the use of U.S.-supplied missiles by Ukraine for strikes inside Russia.

"We were not surprised by Russia's announcement that it would update its nuclear doctrine; Russia had been signalling its intent to update its doctrine for several weeks." "It would be fair to say it's the latest example of irresponsibility that we have seen from the depraved Russian government and we remain steadfast in our support for Ukraine.