The Pentagon is reportedly reviewing and updating its contingency plans for a war with Russia for the first time since the collapse of the Soviet Union, with a defense official telling US media that Russia’s “actions” prompted the assessment.

“Given the security environment, given the actions of Russia, it has become apparent that we need to make sure to update the plans that we have in response to any potential aggression against any NATO allies,” a senior defense official familiar with the plan told Foreign Policy.