US to purchase advanced missile system for Ukraine's defense

The United States is working to finalize the purchase of an advanced air defense system bound for Ukraine, national security adviser Jake Sullivan said at the G-7 summit in Germany Monday.

Developed in Norway, the NASAMS is an anti-aircraft medium-to-long-range surface-to-air missile that can reportedly strike targets 100 miles away.

Sullivan confirmed to reporters that the U.S. is finalizing the purchase but has yet to sign a contract making the purchase official.

It is unclear how much the anti-aircraft system costs.

Biden told his global counterparts at the G-7 and Ukraine's President Zelensky about U.S. intentions, Sullivan said.

The impending purchase of the NASAMS system is part of a package that will also include artillery ammunition and counter-battery radars, according to Sullivan. The Ukrainian military made specific requests for the ammunition and radars, he said.

The NASAMS system is reported to protect restricted airspace around the White House.

Monday's announcement from the G-7 summit comes four days after the White House announced it is sending $450 million in aid to Ukraine. HIMARS missile systems are part of that package.

Hours after the announcement, initial counts are that 10 died and more than 40 were wounded following a Monday missile strike in Kremenchuk in Ukraine's Poltava region.

Residents say the strike hit a shopping mall, setting it ablaze.

The administration and President Zelensky hope the NASAMS system and other recent aid from the U.S. will better equip Ukraine to continue its pushback against Russia in the war, which recently entered its fifth month.

Some G-7 members also announced Sunday they will further tighten their grip on Russia by banning the imports of Russian gold.

The United States, United Kingdom, Canada, and Japan joined together to ban Russia's second-largest import but fellow G-7 members Germany, France, and Italy held out.

The move codifies a ban that many refiners, shippers, and banks already voluntarily implemented themselves, and it highlights how even some of the world's global powers -- those geographically closest to the Russia-Ukrainian conflict -- disagree with how to approach the matter.

The U.S. Treasury will release an official notice of the ban as it concerns U.S.-based businesses Tuesday.

President Zelenskyy met virtually with G-7 leaders Monday as the group moves closer to reaching an agreement that will cap the price of Russian oil, further starving Russia of funds to fuel its war.

ABC News' Fidel Pavlenko contributed to this report.