NATO Secretary-General Mark Rutte expressed solidarity with Poland after an unidentified flying object crashed near the Ukrainian border amid suspicions that it was a Russian missile.

Rutte said he discussed what he described as a Russian missile violation of Polish airspace with Prime Minister Donald Tusk. He added that Poland and NATO had activated their air and ground defense systems.

The alliance will continue strengthening its readiness to defend against all threats, including missile attacks, Rutte said, describing the incident as another reckless Russian action and a dangerous consequence of the war against Ukraine.

Tusk said during a visit to the crash site that preliminary evidence indicated the object was likely a Russian Kh-101 cruise missile. However, he stressed that Poland would await the results of a comprehensive investigation before reaching a final conclusion.

He added that Polish forces had been prepared to shoot down the missile if it had continued along its flight path.

The Polish military had earlier reported that an unidentified object entered the country’s airspace and crashed during an intensive wave of Russian airstrikes against neighboring Ukraine.