The United States has rejected an offer by Poland to transfer its Russian-made MiG-29 fighter jets to a US base in Germany as a way to then supply them to Ukraine's air force.
The United States has sought to speed up weapons deliveries to Ukraine but the prospect of flying combat aircraft from NATO territory into the war zone "raises serious concerns for the entire NATO alliance," the Pentagon said.
The UK also backed the decision, with Transport Secretary Grant Shapps saying that NATO is "a defensive organisation which means we won't be getting directly involved in the war."
