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Published 15:30 28 Apr 2022 BST

Via US Naval Institute[/caption]
Dolphins were posted at Sevastopol during the Cold War, and Ukraine took the unit after the fall of the Soviet Union in 1991. According to the Telegraph, the US navy also attempted to train dolphins during the Cold War, spending a staggering $28 million.
While the dolphins ceased activity in Ukraine, the project was revitalised in 2014 following the illegal annexing of Crimea, where Russia claimed the dolphins "defected" back to the motherland.
"Our specialists developed new devices that convert dolphins’ underwater sonar detection of targets into a signal to the operator’s monitor," a source told Russian news agency RIA Novosti. "The Ukrainian navy lacked funds for such know-how, and some projects had to be mothballed."
While the idea of spy dolphins is relatively scary, given that the creatures could easily drown you, dealing with the aquatic mammals is far from easy. For instance, during a training exercise in 2013, Russians found that their soldiers abandoned the exercise in search of a mate.
An army source told MailOnline: "They deserted a naval exercise and went on manoeuvres of an amorous kind. They swam away to look for mates."