WASHINGTON (Reuters) -U.S. Secretary of State Marco Rubio on Saturday said the incursion of Russian drones into Polish airspace this week was unacceptable but that it remained unclear if Russia had deliberately sent the drones into Polish territory.

NATO announced plans to beef up the defense of Europe’s eastern flank on Friday, after Poland shot down drones that had violated its airspace, the first known shots fired by a member of the Western alliance during Russia’s war in Ukraine.

“We think it’s an unacceptable and unfortunate and dangerous development,” Rubio told reporters before departing on a trip to Israel and Britain.

“No doubt about it: the drones were intentionally launched. The question is whether the drones were targeted to go into Poland specifically.”

Rubio said that if

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