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Any supply of fighter jets to Ukraine must be done through NATO, top Polish officials said on Wednesday, after to fly all its MIG-29 jets to a US airbase with a view to them being supplied to Kyiv.

Ukraine has pleaded with Western nations to provide it with fighter jets to counter a Russian invasion that has forced more than and USÌýlawmakers have responded by pushing's administration to facilitate the transfer of aircraft.

On Tuesday, Poland said it was ready to deploy all its MIG-29 jets to Ramstein Air Base in Germany and put them at the disposal of the United States, urging other to do the same. The Pentagon later dismissed the offer as not "tenable".

"The USA does not want these planes to come to Ukraine from American bases," Jakub Kumoch, the Polish president's foreign affairs advisor, told pulic broadcaster TVP Info. "Poland is ready to act, but only within the framework of the alliance, within the framework of NATO."

has also repeatedly asked the West to implement a no-fly zone over Ukraine, but the USÌýand its NATO allies have rebuffed those calls fearing a direct confrontation with Moscow.

Russia's defence ministry has warned that countries offering airfields to on Russia may be considered as having entered the conflict.

Deputy Foreign Minister Pawel Jablonski told public radio station Polskie Radio 1 that Poland had to prioritise its security when considering the supply of jets to Ukraine.

"It cannot be that Poland has - as the only NATO country - to take the risk, and the other countries would not have to compensate or share it with us in any way," he said.

The MIG-29 is a fighter jet that was developed in the Soviet Union and as Ukraine's military already flies Russian-made aircraft it is the best choice for Ukrainian pilots who already know how to operate them, experts say. Combat pilot training on US-made aircraft can take years and requires a different pipeline for maintenance.

Reuters