Finnish authorities say Russian military aircraft have repeatedly violated Finland's airspace in recent months despite the Nordic country's demands for an end to such actions.
The Foreign Ministry late Thursday said the flights were either on their way to Russia's Baltic enclave of Kaliningrad or returning to Russia when they entered Finnish airspace over the Gulf of Finland.
Russia's Interfax news Agency quotes defense ministry officials as denying any violations.
Finnish officials say Prime Minister Matti Vanhanen will raise the issue during his visit to Moscow next month.
Kaliningrad is a Russian Baltic enclave cut off from the rest of Russia by Belarus, Lithuania and Poland.
Some information for this report provided by AFP, AP and Reuters.