Nothing new here. We’ve been supplying Pakistan with weaponry for decades and the only use the Pakistanis have ever found for those weapons is to attack India. We’re backing the wrong horse.
IMO we’re backing the right horse and the horse is called war.
Chiang Kai-shek did the same thing with weapons we sent him to fight the Japanese; he used it to fight ChiComs instead.
The only direct combat between US soldiers and Soviet troops occurred when the expeditionary force went to Russia after the fall of the Tsar to recover weapons we had sent for Russia to use against the Central Powers (since Lenin was making peace with them).