US President Donald Trump's team has ordered the termination of vital support for F-16 fighter jet jamming equipment that Ukraine has. What is important to understand is that this could deprive the Ukrainian Air Force of its most important air countermeasures.
It’s also worth remembering that a bunch of the electronics in the F35 were developed by BAE Systems. If we really got to the “trying to sabotage the planes sold to allies” stage, America’s F35 fleet would be fucked too.