Putin cited "aggressive words" from NATO members and extensive sanctions imposed by Western nations in issuing the order to prepare Russia's nuclear weapons for higher readiness for launch.
Russia uses the SPFS system internally, which was established after the prospect of being cut off from the SWIFT system in 2015.
President Vladimir Putin declared war on Ukraine, sparking widespread fighting and airstrikes. Since Russia invaded Ukraine, 352 civilians have been dead, according to Ukraine.