The corresponding message was published on the ministry's website.
“The Estonian Ministry of Foreign Affairs today, on September 23, summoned the Ambassador of the Russian Federation to Estonia to protest and hand over a note regarding yesterday’s violation of the Estonian air border,” the country's foreign ministry said.
Details of the incident were not provided.
In August, the Russian Foreign Ministry declared an employee of the Estonian diplomatic mission persona non grata on the basis of the principle of reciprocity after the Estonian Foreign Ministry expelled a Russian diplomat on July 15