"I really want to consult with my Russian colleagues...to get these people freed as soon as possible," Timmermans said. "I don't understand why this could be thought to have anything to do with piracy; I don't see how you could think of any legal grounds for that."
He added he was open to hear the Russian point of view. Russian investigators filed the piracy charges, which can result in a 15-year prison term upon conviction, this week.
"Our ship was illegally detained in international waters following a peaceful protest against Arctic oil drilling and we hope that other states, especially the countries whose nationals are among the detained, will support the Netherlands in this commendable initiative," said Greenpeace lawyer Jasper Teulings.
In addition to Russia the activists hail from 17 other countries: Argentina, Australia, Brazil, Canada, the Czech Republic, Denmark, Britain, Finland, France, Italy, the Netherlands, New Zealand, Poland, Sweden, Turkey, Ukraine and the United States.
The platform, which belongs to Gazprom's oil subsidiary, is the first offshore rig in the Arctic. It was deployed to the vast Prirazlomnoye oil field in the Pechora Sea in 2011, but its launch has been delayed by technological challenges. Gazprom said in September that it was going to start pumping oil this year but did not provide the exact date.
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Associated Press reporter Nataliya Vasilyeva contributed to this story from Moscow.