Sept. 14 (UPI) -- Romania has summoned the Russian ambassador to Bucharest to lodge a protest over Moscow's drone incursion into its airspace, making the second European nation whose airspace has been threatened by the Kremlin's attacks on Ukraine in a week.

Romania's Ministry of Foreign Affairs said it summoned Vladimir Lipaev to its headquarters on Sunday, a day after the incursion occurred.

"The Romanian side conveyed its strong protests against this unacceptable and irresponsible act, which represents a violation of Romania's sovereignty," the ministry said in a statement. "Such recurring situations lead to the escalation and amplification of threats to regional security. The Russian side was requested to take, without delay, all necessary measures to prevent future violations of Romanian airspace.

Romania's Ministry of Defense said in a statement it detected the Russian drone when a pair of F-16 jets were monitoring its border with Ukraine on Saturday at about 6 p.m. local time.

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