Russia's Federal Migration Service said that those granted bail can't leave Russia until the criminal probe against them is over.
But the state ITAR-Tass news agency quoted a well-connected Russian lawyer, Genri Reznik, as saying that the law doesn't ban them from leaving Russia pending their trial. He added that charges against them will likely be dropped under an upcoming amnesty marking the 20th anniversary of Russia's constitution.
Greenpeace will "continue to keep up public pressure to get them released", its leader Kumi Naidoo said in Warsaw, where Greenpeace was an observer at UN climate talks.
"They have been through a very, very tough time. The prison experience has been extremely challenging for them to endure," Naidoo said.
All of those detained were initially charged with piracy, but investigators later changed the charge to hooliganism, which carries a potential sentence of seven years. Bail has been set at 2 million rubles ($61,500).
"Our case is not closed yet," said Allakhverdov. "We will fight for the case to be closed and for us to be found not guilty."
Greenpeace lawyers said an appeal will be filed to release Australian Colin Russell, who was denied bail on Monday. Sinyakov said that he believed that a decision to grant bail to the Greenpeace team came from the top, and Russell was denied bail simply because his case was first and the judge hadn't got the signal in time.
The 30 were arrested in September after the Greenpeace ship, the Arctic Sunrise, entered Arctic waters.
Some of the activists tried to scale an offshore drilling platform owned by the state natural gas giant Gazprom. Greenpeace contends Arctic drilling poses potentially catastrophic environmental dangers, while Russia bristles at any criticism of its oil and gas industry, which is the backbone of the country's economy.
"It became a story of our imprisonment, which is a pity, because the main aim of all this was not any violence or was not confronting anything but to protest oil drilling," Allakhverdov said.
President Vladimir Putin said yesterday that although Greenpeace activists were pursuing noble goals, they were wrong in trying to scale the platform because they jeopardised its safety.
"Not all means are good for achieving even noble goals," he said.
- AP