Estonian officials on June 21 said the violation occurred near the island of Vaindloo in the Gulf of Finland and involved a Tupolev-154M plane belonging to Russia's Interior Ministry, RFE/RL wrote.

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The officials of the NATO nation added that the plane spent about one minute in Estonian airspace near midday on June 20.

They added that the plane had not presented a flight plan and had no radio contact with Estonia's air-navigation system.

The Estonian Foreign Ministry said it summoned Russia's ambassador over the incident.

On March 12, Estonia said a Russian military Il-76 cargo plane had violated its airspace near Vaindloo.

Vaindloo is near a corridor where Russian military and cargo planes fly to get from the St. Petersburg area to the Russian Baltic Sea enclave of Kaliningrad.