Abrams won’t show up for a long time. They could be shipped over, but they cannot be supported (by anyone). The US needs to build a logistical supply chain for these things. That will take serious time and we won’t put the Abrams in the field without it. So this is (to some extent) political signalling that helps justify Germany in freeing the Leopards. Their tanks will be on the field soon. Ours will not.
Yes.
The US shipments of Abrams tanks to Ukraine is more like a symbolic gesture.
It’s foremost a show of political will and unity against the Russia-Chechnya-Belarus-North Korea-IRAN-CSTO coalition.