U.S. to send Ukraine more advanced Abrams tanks — but no secret

Why is the US not immediately sending M1 tanks to Ukraine? I know about the 'secret armor' excuse, but the US senr nearly a 1000 to the dictatorships of Saudi Arabia and

Articles – Page 342 – POLITICO

M1 Abrams — Вікіпедія

Germany – Page 40 – POLITICO

Politics – Page 142 – POLITICO

Secret tech cut in American tanks to Ukraine, fearing Russian capture

Abrams Tanks May Never Reach Ukraine - WSJ

Politics – Page 152 – POLITICO

M1 Abrams – Wikipedie

US joins Germany in sending tanks to Ukraine as Biden hails 'united' effort, Ukraine

What are the Leopard and Abrams tanks being sent to Ukraine?