A drone which crashed into a field in eastern Poland most likely came from the direction of Belarus, a regional prosecutor said on Thursday, following the incident described as a provocation by the defence minister.

A Polish general said early evidence points to the drone having a Chinese engine, and that it was likely "flying very low" to avoid radar.

Polish Defense Minister Władysław Kosiniak-Kamysz lamented the crash, which happened around 2 a.m. on Wednesday near the Polish village of Osiny.

Russia launched 614 air attack munitions into Ukraine overnight into Thursday, the air force in Kyiv said, in a "massive combined air strike" on targets in the country.

A suspected Russian military drone crashed into a cornfield in eastern Poland early Wednesday, exploding on impact and damaging several nearby homes in

The object that crashed near the village of Osiny in the Łuków District of the Lublin Voivodeship was a russian drone. This is a provocation by russia, which

Romania's "aerial surveillance system" identified "groups of drones launched by the Russian Federation that attacked Ukrainian ports on the Danube," the ministry said. "During the mission, there were no penetrations of aircraft in the national airspace."

Poland has delivered a note of protest to the Russian Embassy in Warsaw after a drone exploded inside the NATO member's borders. A spokesman for Poland's Foreign Ministry said: "This afternoon, a note of protest was delivered to the Embassy of the Russian Federation regarding the events that took place in Osinie on the night of August 19-20,

Polish officials said on Wednesday they were not ruling out that an object that exploded overnight in a field in eastern Poland was a Russian or smuggling drone, or a case of sabotage, though they had not detected anything entering Polish airspace.