Last Friday evening, a Russian reconnaissance aircraft was detected over Danish and Swedish airspace. The Russian spy plane reportedly entered Danish airspace around Denmark’s Bornholm, then into Swedish airspace. The mission of the Russian spy is currently unknown.

As a response from the two countries, Denmark and Sweden have summoned their respective Russian ambassadors to explain what the spy plane was doing on their territory. Danish Foreign Minister Jeppe Kofod criticized the Russians for their actions, labeling the act as “unacceptable.” He also reported that the Russian ambassador to Denmark would be summoned on Monday. Details of the meeting have not yet been reported thus far.

“A new Russian violation of Danish airspace. This is totally unacceptable and particularly worrying in the current situation,” the Danish Foreign Minister said.

In a similar response, the Swedish Foreign Ministry had announced that it would be summoning the Russian ambassador to Stockholm. Swedish Defense Minister Peter Hultqvist said that the act from Russia was also unacceptable and was unprofessional. The Swedish response to the incident will prove to be a hint to its future stances in conflict as the country was rumored to be joining NATO as a member along with Finland, countries which have traditionally been neutral.

“There exist established procedures for this kind of case. It concerns notably summoning the representative of the implicated nation to the foreign ministry,” the Swedish Foreign Ministry said to Radio Free Europe/Radio Liberty.