The US Navy conducted reconnaissance off the coast of Crimea. This follows from the data of the monitoring resource PlaneRadar.
At 07:40 Moscow time, the P-8A Poseidon anti-submarine aircraft with tail number 169328 took off from Sigonella air base on the island of Sicily. Boeing crossed the airspace of Bulgaria, and at 11:00 Moscow time it was spotted in the Black Sea, where it began an intelligence operation near Russian borders.
P-8A Poseidon was moving at a speed of about 786 kilometers per hour, the flight altitude was more than nine kilometers.