Luxembourg has deployed additional detection systems to strengthen its airspace monitoring after unidentified drones forced the country's only airport to temporarily suspend operations, the government said on Sept. 20.

A Russian drone struck a civilian merchant vessel sailing under the Tanzanian flag in the Black Sea on Sept. 17, killing its captain and injuring three crew members, Ukraine’s Infrastructure Ministry said.

Poland scrambled fighter jets and temporarily suspended operations at two airports on Sept. 17 as a Russian jet-powered drone approached within about four kilometers (2.5 miles) of the Polish border during an attack on western Ukraine.

The drone either hit its target or was intercepted on the Ukrainian side of the border, Polish military spokesperson Jacek Goryszewski said, according to Polish broadcaster RMF24.