Russian Black Sea Fleet's cruise missile carrying submarine 'Krasnodar' crossed through Istanbul's Bosphorus Strait on Thursday on the way to the Mediterranean Sea.
Turkish coast guard boat accompanied submarine 'Krasnodar' as it sailed through Bosphorus Strait.
Reuters could not immediately confirm the final destination of the attack submarine.
Russia's naval vessels and submarines played a crucial role in Syrian conflict, particularly in 2017, launching missile strikes on Islamic State targets and destroying command posts, weapon, ammunition depots and manpower.
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