Riga had earlier announced that investigators were looking into a drone that had crashed in the eastern part of the country on Saturday.

Latvia, which was once ruled by the Soviet Union but is now an EU and NATO member, has had tense relations with Moscow following independence, and ties have further deteriorated since Russia invaded Ukraine in February 2022.

"The explosive warhead stuck half a meter deep into the ground and was neutralised on the spot, avoiding detonation," Latvian armed forces commander General Leonids Kalnins told a press conference.

This "allowed our military intelligence officers to gather all the debris and remnants from the drone for further investigation, details of which will be shared with all of our NATO partners," he said.

Because of the ongoing investigation, the general did not specify how and when the drone was deactivated.

Latvian air force commander Colonel Viesturs Masulis said "the drone was not aimed at a military target in our country. It sort of drifted into Latvia".

"The drone was seen by our air defences while still deep into Belarusian airspace, which gave us time to react," he said at the briefing.

Defence Minister Andris Spruds said the army had already dispatched additional mobile anti-aircraft units to Latvia's borderlands.

Latvian President Edgars Rinkevics had said Sunday that airspace breaches had increased along NATO's eastern borders.

Romania on Sunday said a Russian attack drone targeting civilian infrastructure in Ukraine had entered its airspace overnight.

Fellow NATO member Poland has also recorded at least two cases of its airspace being violated by Russian missiles or drones attacking Ukraine, most recently in December.