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It took Putin over 15 hours after Gorbachev's death to publish a restrained message of condolence that said Gorbachev had a 'huge impact on the course of world history.'
Gorbachev forged arms reduction deals with the USs and partnerships with Western powers to remove the Iron Curtain that had divided Europe since World War Two.
Moscow has denied involvement in the incident. The Russian foreign ministry said Germany's assertion was not backed by evidence and complained about the way Germany had chosen to release information about Navalny.
The joint Norwegian-Russian expedition set off Saturday from Tromsoe, northern Norway, to the Arctic Barents Sea where the Komsomolets submarine sank at about 1,700 metres in 1989.