A Russian fighter jet was seen intercepting a US anti-submarine spy plane over the Black sea in a tense aerial crash.

Russian sources have said the flight by the Su-35S multirole fighter and P-8A Poseidon aircraft shows the US remains active in intelligence gathering to support Ukraine's war effort off the coast of occupied Crimea.

'The captured payload - traced for the first time - on the American submarine-hunter is of particular interest,' reported Voyenny Osvedomitel military Telegram channel.

'The footage shows, beneath the Poseidon's fuselage, a newly-fitted AN/APS-154 Advanced Airborne Sensor radar.

'There is not much publicly available information about it, but it is known to be a versatile system designed for detecting submarines, surface vessels, and for coastal reconnaissance.