A Canadian arctic patrol vessel recently completed its second mission in a month to monitor North Korean maritime smuggling in violation of U.N. sanctions, Japan’s foreign ministry announced Tuesday.

The Royal Canadian Navy’s HMCS Max Bernays conducted surveillance activities in the waters around Japan in early November, targeting the DPRK’s illegal ship-to-ship transfers, the ministry said in a press release.

Japan welcomed the ship’s visit as part of international efforts to implement U.N. Security Council resolutions on Pyongyang’s nuclear weapons program, adding that it has been conducting its own monitoring activities and sharing information with other countries.

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