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.

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

"What happened in recent days in Poland and Estonia, and what has been happening in Ukraine for four years, concerns us all, because if we don't remain united, sooner or later it will happen to us too,

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.

Increased NATO defense spending alone cannot ensure the alliance’s security if it does not solve its recruitment problem.

NATO is a coalition weakened by the US withdrawal from Europe, doomed to slow decision-making, so Putin will continue to “test the reactions” of his opponents and try out the Alliance without any punishment.

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

Estonia has requested Article 4 consultations after three Russian MiG-31 fighter jets entered their airspace on Friday morning.