Did Russia ever admit that Moskva sank for other reasons than "fire caused a munitions explosion"? It makes sense though, there's no benefit in accusing Ukrain

Did Russia ever admit that Moskva sank for other reasons than "fire caused a munitions explosion"? It makes sense though, there's no benefit in accusing Ukraine in this, otherwise it means 2 things: - anti air defense didn't work - panic between civilians in Crimea (more so than now people already leaving their holidays)