A British journalist who was held in a Russian prison after taking part in a protest in the Arctic two months ago has said that Greenpeace should have "frank discussions" about its tactics.
Freelance journalist Kieron Bryan said his first trip with the organisation had been a "baptism of fire".
Mr Bryan told BBC Radio 4's Today programme that the group were briefed about the risks before the trip: "We discussed the legal implications of doing a protest in Russia. I remember distinctly piracy being mentioned and the laughter that followed.
"I can't stress what a shock it was to everyone. We all thought that we would get a rap on the wrists and then be sent away, so to find ourselves facing 10 to 15 years was a very difficult time."
Greenpeace UK's executive director John Sauven insisted all those who had been on the Arctic Sunrise vessel had been given a proper briefing about the risks involved.
A London journalist has thanked his supporters on Twitter after he was released on bail from a Russian prison. Kieron Bryan was arrested along with Greenpeace activists protesting against oil drilling in the Arctic two months ago. His family and friends have been
A London journalist held prisoner in Russia was today allowed out of jail for the first time in two months. Keiron Byran was arrested along with Greenpeace activists, after a demonstration against an oil rig in the Arctic sea.
He's been freed on bail, but is still facing charges relating to the protest. Today his family got the chance to speak to him for the first time since his arrest. Dan Hewitt reports.
After being released from prison, Kieron Bryan said: "We should keep fighting, we are not free yet. This is a first step and a glimmer of justice but it's not finished.
"It was pretty tough, for everyone I'm sure. More than anything, it's the isolation, not being able to speak to anyone, not being able to speak a common language, being trapped in a cell for 23 hours a day is something I don't ever want to experience again. "
Kieron added: "My plan now is to go to a hotel and have a long shower and never do a Sudoku puzzle again and speak to my family. I am feeling a lot better now, very happy to be out. I have no complaints (about prison conditions).