The U.S.-owned Bombardier ARTEMIS II reconnaissance aircraft, which took off from Romania, headed east over the Black Sea.
According to flight data, the aircraft took off from Romania at approximately 08:40 Moscow time on October 3. As of 09:40, ARTEMIS II was still flying over the Black Sea; its final destination was unknown.
The aircraft's base
ARTEMIS II is based at Mihail Kogălniceanu Air Base in Romania. The aircraft, converted from a Bombardier business jet, was reconfigured by U.S.-based Leidos for radar reconnaissance missions.

Known as ARTEMIS II in its military configuration, the aircraft regularly conducts flights over the Black Sea along Crimea and Russia's southern regions, as well as around the Kaliningrad region.

Russia-NATO tensions
Russia says NATO activities around its western borders have increased to an unprecedented level in recent years. NATO explains its initiatives in the region as part of a policy of deterrence against threats originating from Russia.
The Moscow government has expressed its concern in various statements over the buildup of NATO forces in Europe. Russia's Foreign Ministry said Moscow was open to dialogue with NATO on an equal footing, but that the West should abandon its policy of militarizing the European continent.