Analysts say Ukraine’s European allies can fill some of the gaps and provide artillery systems. But they don’t possess alternatives to the U.S.-made HIMARS missiles and air defense systems, especially Patriots, which are crucial to help defend Ukrainian cities.

The United States is halting some weapons shipments to Ukraine amid its war with Russia, the White House confirmed Tuesday. White House spokesperson Anna Kelly told CBS News in a statement that the "decision was made to put America's interests first following" a Defense Department "review of our nation's military support and assistance to other countries across the globe.