Six European countries have inked defense pacts with the U.S. this month.

Northern European countries are rushing to shelter under Washington’s security umbrella.

A surge of new defense agreements between the U.S. and allies in Northern Europe allow for the fast-track deployment of American troops, marking the latest response to Russia’s invasion of Ukraine.

New multi-year pacts with Sweden, Finland, Denmark, Estonia, Latvia and Lithuania signed this month signal a major shift that has occurred within NATO over the past two years as member countries race to restock arsenals after sending weapons to Ukraine and steel themselves for a new era of confrontation with Moscow.

At the heart of all six defense security cooperation deals are guidelines for allowing U.S. troops to operate in the country for training missions and easing red tape for personnel and their equipment to deploy quickly in case of emergency.