Lupin's North Pole, South Pole Adventures

The target is the Aurora Drop, a diamond adorning a ballerina's forehead. A special remote-control operation nets the diamond easily enough, but a wounded Jigen is rescued by said ballerina, Monika, and ends up helping her put her desire to defect into action. With fake passports declaring them husband and wife, the two of them head for the border.

Synopsis excerpt via Kitsu.