As a result, NATO allies have sent Ukraine hundreds of billions of dollars in military, economic, and humanitarian assistance to prevent it from losing the war and collapsing. The Europeans have received waves of refugees and,

Deterring a Russian attack depends not just on NATO's military forces, but on proof that alliance members can bring new technology to the fight as quickly as Moscow, Adm. Pierre Vandier, who leads NATO’s Allied Transformation Command, said Tuesday in Washington.