Russia 'deployed military DOLPHINS to protect Black Sea naval base as Ukraine invasion began’
- Putin stationed 'spy dolphins' to protect key Black Sea harbour, US satellites find
- Pens of the tactful sea mammals moved to Sevastopol naval base before invasion
- Dolphins used for 'counter diving', protecting harbour against undersea break-in
- They can also carry bombs, plant mines and attack enemy divers, reports claim
- Sevastopol warships out of Ukraine missile range but vulnerable to sabotage
- Flagship the Moskva, images show, was kept at Crimea port before its sinking
