These gals are starting to get to me...
The ongoing saga of the East European MIGs :
Poland, Slovakia, and Bulgaria were going to send jets to Ukraine, but abruptly changed their minds
(1 March) My hypothesis is that these three countries received specific and detailed threats from Putin.
U.S. rejects Poland's offer to give it Russian-made fighter jets for Ukraine

Now the Americans are antsy too; they can't see an operational justification for it (the Ukrainians seem to be doing quite well against what one would imagine to be overwhelming Russian air superiority, but they are still pleading hard for help).

I'm guessing they too are worried about Putin's itchy nuclear button finger.

_{It is rightly acknowledged that people of faith have no monopoly of virtue - Queen Elizabeth II}