Nah they're not worried, if push comes to shove they'll just hack the F-35s! They have got to be one of the largest White Elephants ever! Poor American taxpayer that has to fund this baby of the Military Industrial Complex, for sure!

The Russians probably aren’t too worried about the F-35 fighter - Responsible Statecraft https://responsiblestatecraft.org/2022/03/16/the-russians-probably-arent-too-worried-about-the-f-35