Ukraine’s navy and military intelligence have attacked and destroyed a gas rig used by Russian forces in the Black Sea, a navy spokesman said on Saturday.

“The invaders used this location for GPS spoofing to make civilian navigation dangerous. We cannot allow this to happen,” Dmytro Pletenchuk said on Facebook.

The navy released a video taken overnight showing an explosion on an offshore rig and the ensuing fire. In the same announcement, it states that half a day before the attack, Russian forces had placed equipment and military personnel at the site.

“There were no civilians there. The rig was not performing normal operations,” Pletenchuk said.

He did not provide further details.

Reuters could not independently verify the information and there was no immediate comment from Moscow.

After Russia seized Crimea in 2014, Ukraine lost control of several offshore gas and oil rigs, some of which it says Russian forces have since used for military purposes.