Russian military jets have violated Estonia's airspace, according to officials.

The Estonian Government said the incident involved three MiG-31 fighter jets which entered the country's airspace without permission and stayed there for 12 minutes.

Foreign Minister Margus Tsahkna said Russia had already violated the Nato ally's airspace four times this year, "which is unacceptable in itself, but today's violation, during which three fighter jets entered our airspace, is unprecedentedly brazen".

He added: "Russia's ever-increasing testing of borders and aggressiveness must be responded to by rapidly strengthening political and economic pressure."

Estonia said it had made a protest to the top Russian diplomat in the country.

The incident comes just over a week after more than 20 Russian drones entered Polish airspace.

Just day later they then incurred into Romania's territory.

The Estonian Government said the incident involved three MiG-31 fighter jets (file photo)