Putin refuses to release Ukrainian sailors and ships

Then the Russians attacked and captured three Ukrainian military vessels trying to transit into the Sea of Azov. Their crews were taken into custody, three wounded, and all are being incarcerated in Russia.
If Russia blocks ships destined to Ukraine, particular to Mariupol on the Sea of Azov, that industrial city of more than a half million people will suffer. However, it may be the objective since it is located South of the Russian supported fighting in the Dunbas.
So far, the international community has done nothing. We hear about a a single murder of a Saudi citizen, who was a US Resident. No one seems to care when it is Russia who will strike back.