"The Pentagon would not stand in the way of a possible transfer of Slovakian fighter jets to Ukraine, a senior U.S. defense official told reporters Tuesday. Slovakia, which has already provided military technology to the Ukrainian military that the United States has back-filled, could provide MiG-29 fighter aircraft, Prime Minister Eduard Heger said Monday, according to Politico, though it's unclear how many the country would provide. Earlier during the war in Ukraine, the U.S. nixed a proposed Polish deal that would provide Ukraine with MiG-29 aircraft because the Polish wanted to transfer the planes to U.S. custody first. The Pentagon called the possible deal "high-risk" and not "tenable." The defense official specified that the objection to the previous possible agreement was the role in getting the planes to Ukraine, not Poland's idea to provide the aircraft.
The Slovakian government is looking to move away from relying on MiGs because the upkeep on such aircraft requires a “relationship” with Russia, Heger said, noting that they’re waiting two more years to receive U.S.-made F-16s. Last week, Slovakia provided the Ukrainians with an S-300 air defense system, and U.S. European Command repositioned one Patriot missile system to Slovakia in return."
https://www.washingtonexaminer.com/policy/defense-national-security/pentagon-does-not-object-to-potential-transfer-of-jets-from-slovakia-to-ukraine