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Thanks for this, such good information. Now, looking at this, we can easily say that the tactics were dumb and the overconfident Russian military had suffered a massive consiquence due to their arrogance. The problem here is the execution of tactics. The tactician was to proud and did not consider all possibilities. This does not mean though that the overall plan was stupid. Just that the execution of some oarts of it was bad. In this case, military tactics.
On the night of April 13-14, due to the self-confidence of Russia's top military leadership, the Armed Forces of Ukraine won a major strategic victory at sea. Two Ukrainian-made missiles "Neptune" caused significant damage to the flagship of the Russian Black Sea Fleet - the nuclear-powered missile cruiser "Moskva". After that, the ammunition detonated on the cruiser itself and a big fire started. They tried to tow him to the occupied Sevastopol, but after a while he rolled over and drowned. Russia acknowledged the fact of the death of the cruiser, but hides the causes of the fire.
The Moskva cruiser was designed to protect the entire group of ships located off the coast of Ukraine from enemy missiles and had appropriate weapons for this, capable of firing up to 5,000 rounds per minute, but could not even protect itself. Prior to that, he fired rockets only at peaceful cities in Ukraine, and also had to ensure the large Russian offensive planned from day to day in southern Ukraine. According to information that Russia has not yet confirmed, of the 510 crew members of the cruiser, only 58 sailors were rescued. Almost the entire leadership, led by the captain, perished. Since the rest of the ships of the Russian fleet turned out to be practically defenseless from the air, and the Ukrainian "Neptunes" can reach the ports of the occupied Crimea, they hastily retreated to the south. The Ukrainian armed forces have offered the Russian fleet to leave the Black and Azov Seas while there is such an opportunity.
In Russia, there were only three ships of a similar class as the Moskva cruiser. But there is no need to wait for Russia's help in the Black Sea. The Bosphorus channel at the entrance to the Black Sea was closed by Turkey for all warships, you can only leave this sea, but not enter. Russia was defeated not only on land and in the air, but also at sea.
By the way, not so long ago, the Armed Forces of Ukraine sank a large Russian landing ship called "Saratov" in the occupied port of Berdyansk. True, Ukraine then struck with a Tochka U missile, which was not intended for surface targets.