The U.S. is threatening sanctions for buying Russian fighters

As Robert Pallodino said, the US is afraid about the acquisition of Russian military equipment, including Su-57 fighters. According to him, Washington may choose to usage the Anti-America Act through sanctions of the alleged CATSA. It is simply a bill that allows for the imposition of harsh economical sanctions on the state for, among another things, buying arms in countries that the US considers to be "unfriendly". These words were written during the proceeding before the legislature abroad Affairs Committee.