Russian air defence systems detected US reconnaissance planes over neutral waters in the Black Sea, they were then escorted by a Russian Su-30 fighter, the Defence Ministry said in a statement.
The US planes were continuously tracked by Russian radar monitoring equipment at a considerable distance from the Russian state border, the ministry added.
On 17 June, the USS Porter, a US Navy Arleigh Burke-class destroyer, entered the Black Sea, according to information of Russia's National Defence Control Centre (NDCC).
The Su-30SM was developed by Russia's Sukhoi Company for the needs of the Russian Defence Ministry, according to the firm’s website. The aircraft performed its maiden flight in September 2012.