The United Kingdom has approached the final stage of Brexit. London is thinking about the post-Brexit period of its history and is searching for a new post-Brexit grand strategy, both in terms of its economy and in terms of its defense. Ukraine and the Black Sea are of great strategic importance to the UK. Since 2014, the Black Sea has become one of the most militarized and dangerous seas in the World Ocean along with the South China Sea and the Eastern part of the Mediterranean. Finally, the Great Britain is returning to the Black Sea region. As once during the Crimean (Eastern) War, The British warships and British soldiers will be present in the Northern Black Sea region. Again, the Crimean Peninsula has become a bone of contention.