re the US supplying or helping others supply currently combat capable aircraft such as the Mig-29 etal.
The distance from Kyiv to Moscow is only ~540 miles (870 km). A Mig-29 loaded with DTs and a couple of bombs, flying from Antonov Airport, could easily reach Moscow. Whether they could return safely (fuel wise) I do not know.
There is no way (I think) that the US is going to give Ukraine weapons that can accomplish something like that - not unless the theater situation changes in a very significant way.
Even supplying weapons like the US M270 MLRS system, capable of operating at the grand tactical level, is unlikely (I think). Properly targeted, a
single MLRS launch vehicle salvo (12 missiles x 644 HE/AT submunitions each = 7728 potential targets hit) is designed to effectively take out a tank battalion (30+ vehicles) and any support vehicles (AA, ICV, soft skins, etc), in tactical road column or off-road tactical formation capable of mutual-support. Because the M77 submunitions are dual purpose (ie HE and AT) any unprotected infantry would be decimated as well.
Maybe non-land attack capable anti-ship weapons like the RGM-84 Harpoon? "
The U.S. Delays Delivery of Harpoon Coastal Defense System to Taiwan - Naval Post- Naval News and Information"