Russia has been reducing its usage of conventional long-range attack drones in favor of more advanced, jet-powered ones, the spokesperson for Ukraine’s navy said on Monday.

“The Russians are reducing the number of conventional drones they use while effectively increasing the number of jet-powered drones,” said Capt. 3rd Rank Dmytro Pletenchuk, in an interview with Ukrainian state TV outlet Ukrinform.

“In other words, the Russians are now betting primarily on those,” he added. “At the same time, many different elements of Ukraine’s defense and security forces are involved in countering them. The air force is constantly operating in the south…