Greenland police say they have apprehended veteran environmental activist and anti-whaling campaigner Paul Watson on an international arrest warrant issued by Japan. Watson, a 73-year-old Canadian-American citizen, is a former head of the Sea Shepherd Conservation Society known for high-seas confrontations with whaling vessels. A police statement said he was arrested Sunday when his ship docked in Nuuk, Greenland’s capital. He later appeared before a district court. On Monday, the Captain Paul Watson Foundation said the veteran environmentalist would be detained in Nuuk at least until Aug. 15, following the court’s decision. He faces a maximum sentence of 15 years in prison in Japan.