Russian Navy Ka-31 AEW

The Kamov Ka-31 was developed for the Soviet Navy and currently in service in Russia, China and India in the naval airborne early warning and control role.

The radar of the Ka-31 airborne early warning helicopter has a 360° coverage and can spot aircraft-size target from 150 km range. Surface ships are spotted from 100–200 km range. Radar can track 30–40 targets simultaneously. The helicopter has a datalink to transfer target tracking data.
It entered service in very limited numbers with the Russian Navy in 1995 with its Admiral Kuznetsov-class aircraft carrier and Sovremenny-class destroyers.
The Indian Navy ordered four Ka-31 radars in 1999, and a further five in 2001, delivered in 2005.

Chinese PLA navy official publication revealed Ka-31 helicopter in February 2013.

https://en.wikipedia.org/wiki/Kamov_K...