This is old news. The US has had this capability for almost a decade.
The satellites in the Naval Ocean Surveillance System (NOSS), which are also referred to as Whitecloud, were placed in orbits of 1600 km altitude with an inclination of 63° and a separation of 100°. It is believed the satellites carried side and forward looking radar, multi-spectral scanners and infra-red detectors and are said to have had the capability to detect warm water in the wake of a submerged nuclear submarine. To date, three separate generations have been identified, but the NOSS program remains highly classified.
Russia seems to want this technology. This technology not new to the US