US is 'working with Poland to supply Ukraine with fighter jets' to stem Russian advance and risk the wrath of Putin as his invasion flounders: Biden speaks to Zelensky promising 'financial and security support'. United States is working with Poland to supply 28 MiG-29 fighter jets that can be used by Ukrainian Air Force. In return, Poland has asked for F-16 fighter jets to be given to the country as backup in exchange for the MiGs. Ukrainian air force require Russian fighter aircraft because those are the models they have been trained on. Ukraine's president has lashed out at NATO powers for refusing to impose a no-fly zone over his country. NATO rejected calls, saying a no-fly zone could provoke widespread war in Europe with nuclear-armed Russia. President Joe Biden has called Ukrainian President Volodymyr Zelenskyy to discuss ongoing efforts to impose economic costs on Russia and to speed U.S. military, humanitarian and economic assistance to Ukraine.