Japan's sea shipment of a ton of plutonium from France to Japan on Nov. 7, 1992, faced strong public opposition, as did a previous one in 1984, from various public interest groups, independent analysts, and Members of Congress. The shipment arrived safely in Tokyo Jan. 4, 1993. Several more shipments at intervals of about 3 years are expected. While the plutonium is owned by Japanese utilities, it was produced from uranium enriched in the United States and supplied under a U.S.-Japan agreement for nuclear cooperation, revised in 1988. Although the agreement ties some strings to what Japan can do with nuclear imports from the United States, it also in effect gives to Japan a 30-year advance consent to ship plutonium subject to informing the United States.