The family of jailed British journalist Kieron Bryan will meet Foreign Office officials early next month to discuss his case.
The 29 year old video journalist was detained by Russian special forces after they stormed the Greenpeace vessel Arctic Sunrise in September.
He is currently facing charges of hooliganism along with 29 activists who are all being held in the Russian port city of Murmansk.
Kieron’s brother Russell said: "One crazy charge has been replaced with another.
"My brother doesn't get into arguments, let alone violence. He's not a pirate and he's certainly not a hooligan. He is a journalist, who was doing his job."
— Jonathan Ross (@wossy) October 29, 2013
He added: "The charges are totally disproportionate. We want the silent protest to indicate that – to let the Russian Embassy know that we think the charge is unfair and unfounded.
"We have had a lot of support from Kieron's former colleagues on The Times, several newspapers, Sky, BBC and ITV – the press have been very good to us, helping us get our message out there.
"We have also had some great assistance from politicians, so we are hopeful."
The videographer, who had been living and working in London before his arrest, is being kept in his cell for 23 hours a day.
He faces a prison term of around seven years if convicted of hooliganism.
Contact between Mr Bryan and his family in England has been scant, although he has managed to make two phone calls home.
His brother said: "My mum has a call from Kieron, which she really needed.
"He tries to look on the bright side of things, he's quite a positive person, so I think he is almost trying to keep our spirits up.
"But when you're pretty much on your own for 23 hours a day, like he is, there can be some quite dark moments."
Saturday's silent protest, which will take place from noon to 2pm outside the Russian Embassy at 6-7 Kensington Palace Gardens in west London, will see campaigners place stickers over their mouths in a gesture that some say demonstrates the censorship which has resulted in Mr Bryan's detention.