A top Chinese-made Pakistani fighter plane shot down at least two Indian military aircraft on Wednesday, two US officials told Reuters, marking a major milestone for Beijing's advanced fighter jet.

An Indian Air Force spokesperson said he had no comment when asked about the Reuters report.

The performance of a leading Chinese fighter jet against a Western rival is being closely watched in Washington for insights into how Beijing might fare in any showdown over Taiwan or the wider Indo-Pacific.

One US official, speaking on condition of anonymity, said there was high confidence that Pakistan had used the Chinese-made J-10 aircraft to launch air-to-air missiles against Indian fighter jets - bringing down at least two.

Another official said at least one Indian jet that was shot down was a French-made Rafale fighter aircraft. Both officials said Pakistan's F-16 aircraft, made by Lockheed Martin, were not used in the shootdown.

Delhi has not acknowledged the loss of any of its planes and instead said it carried out successful strikes against what it said was "terrorist" infrastructure inside Pakistan.

World powers from the US to Russia and China have called for calm in one of the world's most dangerous, and most populated, nuclear flashpoint regions.

In France, Rafale manufacturer Dassault Aviation consortium, which makes the Meteor air-to-air missile, could not immediately be reached for comment.

While Reuters reported on Wednesday that three Indian planes went down, citing local government officials in India, this marks the first Western confirmation that Pakistan's Chinese-made jets were used in the shootdowns.

Pakistan's Defense minister, Khawaja Muhammad Asif, told Reuters on Thursday that the J-10 was used to shoot down three French-made Rafale planes, which were newly acquired by India. Altogether, Pakistan says it downed five Indian planes in air-to-air combat.

The Rafale and the model of the J-10 used by Pakistan are both considered generation 4.5 fighter jets, placing them at the leading edge of combat aircraft.

Western analysts and defense industry sources said the live use of some of the advanced weapons that could be deployed in future major power conflicts would be scrutinized in minute detail, but emphasized it was too early to draw firm conclusions.