United States military and NATO officials are discussing a possible plan that could be unveiled in the coming days that would provide Ukraine with much-needed aerial defense weapons, including Patriot systems, by funneling U.S. weapons through the European alliance, officials said.

If the plan is finalized, it would allow critical aid to flow to Ukraine as it endures one of Russia’s heaviest assaults of the war.

Secretary of State Marco Rubio said Friday that some of the U.S.-made weapons that Ukraine is seeking are deployed with NATO allies in Europe.