https://www.vice.com/en_us/article/jgmz4d/russia-has-deployed-dolphins-to-the-black-sea

According to satellite imagery, Russia has deployed trained dolphins to a Crimean port in the Black Sea.

As first reported by analyst H I Sutton at USNI News—a site run by the U.S. Naval Institute—Russia has moved trained military dolphins to Sevastopol harbor on the Black Sea. Satellite imagery from the port shows the presence of two animal pens just inside the sea wall. The pens arrived in February, according to Sutton, around the same time Russia escalated its war in Ukraine.