There's a Russian surface to air missle umbrella covering Ukraine. This is why Ukraine's existing air force is either grounded or forced to fly brief low-level sorties to engage Russian attack helicopters. A handful of Polish Mig 29s will do zero to change the balance of air power in this conflict. BUT since the Mig 29 has offensive capabilities, even the act of a NATO member giving offensive weapons to Ukraine would be an act of aggression against Russia by NATO. Russia would respond and NATO article 5 would be triggered. Exactly what the Neocommies in DC want.