Madonna join chorus calling for release of jailed Greenpeace members

A Russian Coast guard officer is seen pointing a gun at a Greenpeace International activist as five activists attempt to climb the Prirazlomnaya.

Pop legend Madonna has joined a chorus of international stars in urging the release of 30 Greenpeace crew members jailed after a protest against energy prospecting in the Arctic.

"These 30 people are in prison in Russia for staging a peaceful protest in the Arctic! Let your voice be heard. Let's bring these people home!'' Madonna wrote in a message posted by Greenpeace on Twitter.

.@Madonna voices her support to #FreeTheArctic30. Join her call and help bring them home: http://t.co/gz2xTKokhQ pic.twitter.com/7ajahkawlc

She spoke out after former Beatle Paul McCartney published a letter to President Vladimir Putin saying he hoped the activists could be home for Christmas.

The following day, Oscar-winning French actress Marion Cotillard climbed into a cage outside the Louvre in Paris to call for the activists' release, calling their detention "absolutely absurd and crazy".

The activists from Greenpeace's Arctic Sunrise icebreaker are awaiting trial in prisons in Saint Petersburg, where they were moved from the far northern city of Murmansk.

German Chancellor Angela Merkel has already voiced concern over their case while British Prime Minister David Cameron last week urged Putin to treat the so called "Arctic 30" fairly.

Russia's Investigative Committee said last month it was softening the charges against the crew members, who come from 19 different countries (including Australian Colin Russell), from piracy to hooliganism, which carries a maximum sentence of seven years.
But Greenpeace says the piracy charge was never formally lifted.

Madonna has previously used Russian concert performances to speak out on politics.

At a concert in Moscow last year she called for the release of Pussy Riot band member who are now serving a two-year jail term for a protest against Putin.

She also gave fans pink ribbons at a concert in Saint Petersburg to express her opposition to controversial legislation banning "propaganda" of homosexuality to minors.

- AAP