Ukrainian President Volodymyr Zelenskyy said Poland would help form a coalition of Western powers to supply warplanes to Kyiv, as his fighters continued to defend their eastern bastion of Bakhmut in the face of relentless Russian assaults.

During a visit to Warsaw on Wednesday, Zelenskyy said Poland had been instrumental in getting Western allies to send battle tanks to Ukraine and he believed it could play the same role in a "planes coalition."

The Polish government said it would send 10 more MiG fighter jets on top of four provided earlier, but so far there has been no agreement from the United States or Ukraine's other major military backers to send the F-16 fighters Kyiv has requested.