The U.S. will provide $1.2 billion more in long-term military aid to Ukraine to further bolster its air defenses as Russia continues to pound Ukraine with drones, rockets and surface-to-air missiles, U.S. officials said Monday.The aid package is expected to be announced on Tuesday and the money will be provided under the Ukraine Security Assistance Initiative. Unlike the U.S. equipment, weapons and ammunition that are more frequently sent to Ukraine from Pentagon stocks — so they can be delivered quickly — this money is to be spent over the coming months or even years to ensure Ukraine's future security needs.