Did Russia Try to Debunk the 13 Hero Ukrainians on Snake Island Story Concocted to Rally Support for Ukraine?

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As they say, all’s fair in love and war, so that the Ukrainians made-up the story about the 13 soldiers on Snake Island blown-up by a Russian warship (they were captured) was just a great play, rallying global support, yet what’s surprising is that Putin didn’t rebut the claim, did he not know?