Photo: Getty Images
Press Secretary Jen Psaki told reporters there are "clearly logistical challenges" involving Poland's offer to give fighter jets to Ukraine.
NATO and Ukrainian officials are involved in the talks.
Psaki was asked about sending the jets to a U.S. airbase in Germany or shipping them in parts into Ukraine. She said it's all part of "logistical and operational challenges" that are being discussed by U.S. defense officials and European allies.