Willcox was captain of the Arctic Sunrise, a 170-foot Greenpeace vessel that was seized by Russian special forces on Sept. 19 in the Arctic Sea, about 600 miles from the northern Russian port city of Murmansk.
Willcox and crew were charged with piracy, following their protest against drilling by the Russian company Gazprom outside its oil rig in the Arctic.
On Wednesday, Willcox and the other Greenpeace members were granted amnesty by the Russian parliament.
Some believe the amnesty decision was to avoid criticism on the country's human rights record with the 2014 Winter Olympics scheduled to begin in Sochi, Russia in February.
The piracy charges were lowered Nov. 10 from piracy, which carried a 10 to 15-year prison sentence, to hooliganism which carries a sentence ranging from no time in prison to a maximum of seven years. In Russia, however, sentences of less than eight years can be suspended.
The group, including Willcox, was held in prison for two months before being released on bail, just before Thanksgiving.
Willcox is now back in Maine with his wife, Maggy, the publisher of the Islesboro Island News.