Earlier, Estonia's prime minister confirmed he would be seeking a NATO Article 4 consultation over Russia's alleged violation of the country's airspace.
The mechanism allows any member country to formally bring an issue to the attention of NATO's principal decision-making body, the North Atlantic Council, to meet and discuss next steps with allies.
Members will consult when "the territorial integrity, political independence or security" of any members is threatened.
It should not be confused with Article 5, the cornerstone of the alliance, which states an armed attack on one NATO ally will be considered an act of violence against all members and prompt assistance to the member concerned.
Discussion triggered by Article 4 could "potentially lead to some form of joint decision or action," according to NATO, but outcomes depend on consensus among members.
NATO spokesperson Allison Hart has said that the North Atlantic Council will convene early next week to discuss the incident in more detail.