The Biden administration is poised to dramatically expand the scope of weapons it is providing Ukraine, U.S. officials said Tuesday, with the Pentagon looking to transfer armored Humvees and a range of other sophisticated equipment.

Preliminary plans circulating among government officials and lawmakers in Washington also included Mi-17 helicopters, howitzer cannons, coastal defense drones and protective suits to safeguard personnel in the event of a chemical, biological or nuclear attack, the officials said, though they cautioned that it was not immediately clear if all of those items would end up in the final aid package.

Pentagon spokesman John Kirby declined to comment. On Tuesday night, after this article was published, another U.S. defense official said the Russian-made helicopters would not be included.