Operation Atlantic Resolve, refers to military activities in response to Russian operations in Ukraine, mainly the War in Donbas. It was funded under the European Deterrence Initiative. In the wake of Russia's 2014 invasion of Ukraine, the US and the UK took several immediate steps to enhance the deterrence posture along the eastern flank of the North Atlantic Treaty Organization (NATO), including augmenting the air, ground and naval presence in the region, and enhancing previously scheduled exercises.