There's no need to go to western media lol.
And we don't know anything about JATM, except it will be a new BVR AAM that can fit a modern AIM-120 form factor. PL-17 is much larger than AIM-120 as well as PL-15 for that matter, so they should not be directly compared.
We already know a fair bit about PL-17.
Basically it is a very long range BVR AAM, carried externally by aircraft (not able to be carried internally by 5th generation fighters due to size), and has a use case against force multipliers (tankers, AEW&C etc) but should also be capable against other aircraft like fighters and bombers.
Long range (thought to be 400km or more) is enabled by multi-stage rocket motor, trajectory, potent onboard sensors (which may or may not have an ImIr element in addition to its ARH which may or may not be AESA), and networking capabilities.