The Ukrainians need tanks to go on the offensive, so it is hardly surprising they are asking for them. I felt last year that the request should be granted, as it is unlikely that the tanks would be used for operations within Russia’s borders. NATO has finally taken my decidedly non-professional advice. Ukraine fans shouldn’t get their hopes too high, however; tanks are most effective when massed, and it isn’t clear that they will be getting enough to make much of a difference.
The Ukrainians also want advanced fighters. I didn’t, and don’t, support this request. There is little evidence that the Russian Air Force controls the skies, fighters are very expensive, extensive training for pilots would be required, and we don’t exactly want the Russians shooting our planes down and reverse engineering them. The costs outweigh the benefits in this instance.