ICYMI - Turkey has cut off access to the Black SeaFrom the report a little earlier:
Turkey's Foreign Minister, Mevlut Cavusoglu, revealed that all countries have been warned not to transit warships through the straits. The decision which was made during a Turkish cabinet meeting today closes the Dardanelles and Bosphorus straits to all militar
Source: ICYMI - Turkey has cut off access to the Black Sea (https://www.forexlive.com/news/icymi-turkey-has-cut-off-access-to-the-black-sea-20220301/)
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