Can an old MiG-21 aircraft destroy a more modern F-16? Yes, in fact an Indian pilot flying a version of the MiG-21 called Bison allegedly shot down a Pakistani F-16 using a Russian R-73 Vympel air to air missile, known as a high off bore-sight air-to-air weapon.
Anything that can be done to flare up tensions between these two adversaries then serves the US’s goals of sowing chaos and division to keep the things from progressing smoothly.
The reckless advocacy by Washington is predictably leading to a spiral of violence which ultimately could result in an all-out war between two nuclear states.
The US, it seems, after earlier chastising Pakistan (for not doing enough to curb the Taliban) has done a major U-turn: Washington is now embracing Pakistan (with Saudi Arabia and UAE writing the cheques).