Greenpeace journalist Kieron Bryan, from London, has said he fears "losing years of his life" in a Russian jail after being arrested over a protest against oil drilling.
Mr Bryan is one of the "Arctic 30" detained on board their boat the Arctic Sunrise and accused of piracy by Russian authorities.
In a letter to the Sunday Times today he said: "My greatest fear is being kept from my family, my friends and my girlfriend for any great length of time.
"In many ways I'm lucky I don't have children who depend on me, but the fear of losing years of my life and the opportunity to perhaps start a family is terrifying".
Mr Bryan was denied bail in a Russian court earlier this month along with his fellow protestors.
More top news
People have been protesting outside the French Embassy today over burkinis being banned on some beaches in France.
Police have released CCTV footage to try to track down a gang who robbed two teenagers of their bikes and mobile phones.
An 18-year-old man has become the first person to be convicted following a night of what police describe as "disorder" in Hyde Park.