After multiple Russian drones violated NATO airspace, Europe faces questions over the alliance’s long-term ability to deal with this growing threat.

NATO's North Atlantic Council will meet on Tuesday to discuss Russia's violation of Estonian airspace, two officials familiar with the matter told Reuters on Sunday, specifying the date that so far has only been described as early next week.

NATO has reacted after Russian military jets breached Estonian airspace on Friday, marking a fresh provocation near the bloc's eastern flank. Three Russian fighter jets entered Estonian airspace for several minutes earlier in the day, before leaving again, according to the Estonian Ministry of Foreign Affairs.

A senior Estonian military official said Russian pilots ignored signals from Italian jets during a 12-minute violation of Estonian airspace.

A new memorandum will see Ukrainian forces training Polish troops in counter-drone tactics. It's a moment of recognition of Kyiv's growing expertise.

NATO member Poland has called for the U.S.-led alliance to consider a no-fly zone over Ukraine since nearly 20 Russian drones crossed over into Poland early on September 10 in the midst of extensive Russian attacks on neighboring Ukraine. About three are thought to have been shot down in operations backed by other NATO countries.

"We saw on Friday that NATO is functioning very efficiently... even to the point that if we were truly forced to use the last resort, which is the use of force, then there was a readiness for that as well,

Three Russian MiG-31 fighter jets flew into Estonia on Friday, escalating tensions and marking the latest violation of NATO airspace by Moscow.

Polish President Karol Nawrocki on Sunday signed a classified decree permitting a permanent NATO troop in Poland as part of Eastern Sentry.

The Polish military statement gave few details, but the incident follows the U.S. Army Special Operations Command announcing that four of its soldiers were killed in a crash involving a U.S. Army MH-60 Black Hawk helicopter in Washington state on Wednesday.