Not reported much in US media, but mentioned in this Forbes article and big news in Europe...
"...the administration of U.S. President Donald Trump has halted U.S. aid to Ukraine, including vital support for the F-16s’ radar jammers."
So get this straight, the US is disabling vital capabilities of a weapons system a US company sold to an ally.
Putting aside the horrendous ethical and political implications, what allies are now going to buy these vulnerable US weapons?