The ongoing talks, as President Volodymyr Zelenskyy pleads with Congress for help, underscore the frantic push to find weapons to equip Ukrainian forces as they continue to fight off the massive Russian invasion.

As Poland weighed sending its warplanes to Ukraine last week, Warsaw asked the White House if the Biden administration could guarantee it would provide them with U.S.-made fighter jets to fill the gap. The White House said it would look into the matter. The Biden administration didn’t oppose the Polish government giving Kyiv the MiGs, which could potentially escalate tensions between NATO and Moscow. Poland, for now, has held on to its fighter jets.

Discussions between Warsaw and Washington are still underway, though authorization for new, replacement fighter jets to Poland could take a long time.