Five activists were protesting on the oil platform when they were arrested by Russian police and two will be charged and could spend up to 15 years in prison.
The five had taken an inflatable boat from the larger ship, the Artic Sunrise which was also detained by the Russian version of the Coast Guard.
In all, 30 people from 18 different nations around the world were held for at least a short time near the city of Murmansk.
Greenpeace argues that the larger ship didn’t violate the mandated 500 yard security zone but Russian officials disagree and say they were concerned by equipment on the ship that was considered questionable.
The large rig in the Arctic is owned and operated by Russian state-controlled energy giant Gazprom.