After 15 months at sea, fugitive eco-warrior Paul Watson has disembarked in the United States despite an international Interpol request for his arrest, his organisation Sea Shepherd announced Thursday.

Watson, a 62-year-old Canadian, arrived in Los Angeles on Monday, passed through customs and "was not arrested", Lamya Essemlali, head of Sea Shepherd France, told AFP.

He decided to disembark to testify in a court case due to take place next week in Seattle over his marine conservation organisation's actions in Antarctica against Japanese whalers, Essemlali said.

Watson was arrested in May last year in Frankfurt on a warrant from Costa Rica, where he is wanted on charges stemming from a high-seas confrontation over shark finning in 2002.

He was released on bail after paying a fine, and was ordered to appear before police twice a day. But he skipped bail on July 22, 2012 and fled Germany.

The following month, France-based Interpol issued an international request for his arrest.

The organisation does not have the power to issue international arrest warrants but can ask member countries make arrests based on foreign warrants through a "Red Notice".

Watson, known to his supporters as "The Captain", had been on the run at sea since then, and even participated in a new campaign against Japanese whalers in Antarctica last winter.

But he said on Twitter Thursday that he was no longer the subject of Interpol's "Red Notice".

And when an anti-whaling fleet he had been on docked in Australia in March, he made no appearance on the ground but the country's attorney-general had hinted he would not be detained if he came to shore.

Japanese authorities describe methods used by Sea Shepherd against whaling ships -- for example blocking the boats' propellers -- as "terrorist".

Also on HuffPost:

Loading Slideshow...
  • A group of Clark College students attempted to dramatize air pollution by taking walks around Vancouver wearing gas masks as an Earth Week project, April 21, 1970. "We’re trying to show the effects of pollution, but most ignore us," said one of them, Ken Cochran.

  • An estimated 7,000 people jam a quadrangle at the Independence Mall in Philadelphia, during Earth Week activities celebrating the eve of Earth Day, April 22, 1970.

  • A woman dressed as the Statue of Liberty poses on a float full of trash during Earth Day observances in Florida in 1970.

  • Kenneth Opat is squirted with oil pistols by Dorothy Goldsmith, left, and Rita Webb, at Tulane University in New Orleans as students tagged Louisiana's oil industry with the "polluter of the month" award, April 22, 1970. The demonstration was part of the first observance of Earth Day.

  • Earth Day demonstrators trying to dramatize environmental pollution conclude their rally at the Interior Department in Washington on April 22, 1970, leaving spilled oil in their wake. The oil was used to protest pollution by offshore oil drilling.

  • A participant at Earth Day celebrations at Union Square in New York City carries a sign protesting killing, April 22, 1970. Thousands crowded the square, where official observances were held, and Fifth Avenue all the way to 59th Street, where vehicles powered by internal combustion engines were banned.

  • Dec. 13, 1974: Protesters lash themselves to the branches of five trees in Amsterdam which are to be cut down to make way for the building of the Underground near Central Station.

  • A score of people seeking attention for their view that the public is endangered by radiation pollution from the Atomic Energy Commission (AEC) held a one-hour vigil Tuesday at the AEC Rocky Flats plant in Denver, Co., Dec. 22, 1970. Credit: Denver Post

  • Earth First environmental activists sit around the stump of an ancient tree that was cut down by a logging company in one of the last remaining unprotected old growth forests in California Sept. 28, 1996. Eco-activists dress, set up camp and live in the trees to protest the planned logging. The activists use code names such as (L-R) Dragonfly, Seed and River to conceal their identities when trespassing on the privately owned forest.

  • Police lower an anti-nuclear activist from a bridge leading to the Gorleben nuclear waste storage facility near Lueneberg in northern Germany, March 27, 2001. Four Greenpeace activists had attached themselves to the bridge in an effort to blockade the railroad tracks running across it. An estimated 1,400 activists blockaded the tracks at different points in an effort to stop the Castor shipment of spent nuclear fuel from arriving from France. Police arrested hundreds of activists, some of whom were reportedly injured.

  • A Greenpeace activist is dragged into a police truck after hauling a van containing toxic waste in front of the U.S. Embassy in Manila, Philippines, March 3, 2000.

  • Members of Greenpeace hang a banner, March 20, 2000, saying "Stop Dioxin" on a tank at a Chemical Waste Treatment Center in Tsing Yi to protest the Hong Kong government's plan to burn medical waste at the facility. Incinerators for medical and municipal waste have been linked to severe public health problems and pollution and are believed to be the major source of dioxin released into the atmosphere.

  • Members of Surfers Against Sewage hold a "toilet protest" August 8, 2001 on Brighton Beach on the south coast of England. The protest was designed to highlight the fact that Britain''s coastline is one of the most contaminated in Europe, with raw sewage being pumped onto public beaches.

  • Activists from the environmental organization Greenpeace rappel from a statue of Christ the Redeemer in Rio de Janeiro, Sep. 5, 2002. Activists were protesting results of the World Summit on Sustainable Development, or Rio + 10, in Johannesburg. Banner reads: "Rio + 10 = Second Chance."

  • Anti-Waikato water protesters build a barricade in front of the gate Jun. 3, 2002 as about 70 protesters converge on to the Tuakau pumping station to protest the new Waikato pipeline that will pump water from the Waikato river to supply Auckland City. Many people are against the pipeline as they think the Waikato river water is not safe to drink.

  • Japanese crew members from whaling ship Kyo Maru 1 use water cannons to disperse Greenpeace activists during an anti-whaling demonstration in the frezzing water of the Southern Ocean, Dec. 16, 2001. The activists repeatedly used their inflatable boats to slow the transfer of a freshly harpooned minke whale.

  • Greenpeace activists stage a protest in front of the Ministry of Economic Development and Trade, Moscow, Jun. 4, 2003. About 10 members of Greenpeace protested Moscow's failure to ratify the Kyoto agreement and to improve climate controls in Russia.

  • Greenpeace activists hang an inflatable whale off the top of Berlin's television tower, Jun. 15, 2003, in a protest action ahead of the annual meeting of the International Whaling Commission due to take place from June 16-19 in Berlin. The banner reads "IWC: Act now!".

  • Police and fire officials use the jaws of life in an attempt to cut free a group of Greenpeace activists who chained themselves to the entrance of the Auckland Airport incinerator to protest the emissions of deadly dioxins, Apr. 29, 2003.

  • German riot police watch over some 150 anti-nuclear demonstrators blocking railway tracks near Rohstorf, Nov. 11, 2003, in a bid to stop a train transporting radioactive waste material to a storage facility in Gorleben. The 12 containers are coming from the French nuclear treating facility of La Hague.

  • Militants of the French anti-nuclear network Sortir du Nucleaire (Exit Nuclear) demonstrate on a Brittany beach, July 18, 2004 in Carnac, against the European Pressurized Water Reactor (EPR) project.

  • Five Greenpeace activists climb the rocks above the Mirabeau Tunnel to protest the transport of weapons-grade plutonium, which will travel through the tunnel on its way to Cadarache north of Marseille, Oct. 7, 2004. A lorry carrying a shipment of plutonium from U.S. weapons arsenals was being escorted through France en route to a reprocessing plant in the southwestern town of Cadarache.

  • A Greenpeace activist remains attached to the anchor chain of cargo ship Global Wind, May 3, 2004, anchored offshore 40 kms from the port of Paranagua, southern Brazil. The activists try to prevent the ship, which set sail from Argentina with a load of 30,000 tons of transgenic soy and is expected to complete her cargo in Brazil, from continuing navigation to Paranagua. Curitiba, 3/05/2004. Ativista do Greenpeace acorrentado na ancora do Navio Global Wind, procedente da Argentina com 30mil ton. de soja transgenica, a 40 km do porto de Paranagua/ foto: Orlando Kissner. (Photo credit should read ORLANDO KISSNER/AFP/Getty Images)

  • Members of Greenpeace carrying anti-nuclear signs stage a rally in front of the Japanese Embassy, Nov. 25, 1992, to protest the progress through the Atlantic Ocean of the Japanese freighter Akatsuki Maru with its cargo of 1.5 tons of plutonium. The ship left France on Nov. 7 and is heading for Japan.

  • Greenpeace vessel SV Rainbow Warrior crewmember Sarah McNab, of New Zealand, tests an inflatable, Aug. 25, 1995, as the ship sails towards the French nuclear test site atoll of Mururoa. A flotilla of 26 vessels is sailing to Mururoa for an anti-nuclear protest. The enviromental group has a total of four ships in the flotilla, while the rest are independent vessels.

  • The Greenpeace helicopter dumps hundreds of liters of polluted water from downstream of the Tasman Pulp and Paper Mill into the mill's water intake on May 9, 1993 as part of its continuing protest of the company's dumping of 150 millon liters of organochlrine contaminated effluent every day.

  • Julia "Butterfly" Hill stands in a 200-foot tall old-growth redwood tree in Humboldt County, Calif. in this undated 1998 photo. Hill spent 738 days living in a tree in the Headwaters Forest to protest old-growth redwood logging by the Maxxam Corporation.

  • This aerial photograph taken Sept. 30, 2006 by Greenpeace shows a huge circle made by local farmers and Greenpeace volunteers on a corn farm planted with a genetically-modified Bt corn in Isabela province, 300 kilometers north of Manila. The crop circle, with a slash over the letter "M" symbolizes farmer rejection of genetically-modified Bt corn crops from the Monsanto corporation. The protest coincides with a Global Day of Action to protect corn, one of the world's most important staple foods, against contamination from genetically-engineered varieties.

  • A police officer escorts American actress Daryl Hannah to a police van as she gives a peace sign after being arrested during a protest against the construction of the Keystone XL pipeline, outside the White House in Washington, DC, Aug. 30, 2011. Hannah was among dozens of protestors arrested in a demonstration against the oil pipeline which, if constructed, would run from Alberta's oilsands in Canada to Texas.

  • A protester is escorted from the hearing room after disrupting the hearing of BP Chief Executive Tony Hayward (R) on the Gulf Coast oil spill on Capitol Hill, June 17, 2010 in Washington, DC.

  • A protestor who identified herself as Kat wears face paint during a demonstration against fracking outside of the California Environmental Protection Agency (EPA) headquarters on July 25, 2012 in Sacramento, Calif. Dozens of environmental activists staged a "Stop Fracking With California" demonstration outside the California EPA headquarters ahead of public workshop hosted by the Division of Oil Gas and Geothermal Resources where protestors are planning to voice their opposition to the rushed regulatory of fracking and the many threats to the environment imposed by the process of hydraulic fracking for oil and gas.

  • Naked cyclists take part in the World Naked Bike Ride on March 3, 2013 in Melbourne, Australia. The bike ride is intended to "peacefully expose the vulnerability of cyclists, humanity and nature in the face of cars, aggression, consumerism and non-renewable energy."

  • 35,000 people from 28 states are converging in the streets to show President Obama the broad public support for climate solutions, while also challenging him to keep his commitment of making climate action a top priority during his second term on Feb. 27, 2013 in Washington, DC. The president has several actions that he alone can take, including rejecting the Keystone XL tar sands pipeline and adopting a strong carbon rule to limit pollution from coal plants.

  • In this handout picture released by The Maldives Presidency, Fisheries and Agriculture Minister Ibrahim Didi signs the decree of an underwater cabinet meeting off Girifushi Island on Oct. 17, 2009.

  • A protestor stands in a tree to attempt to block the construction of the Keystone XL pipeline in Texas on Jan. 3, 2013. <a href="http://www.tarsandsblockade.org/15th-action/" target="_blank">Source</a>