Under American pressure Japan worked toward a comprehensive security strategy with closer cooperation with the United States for a more reciprocal and autonomous basis. This policy was put to the test in November 1979, when radical Iranians seized the United States embassy in Tehran, taking sixty hostages. Japan reacted by condemning the action as a violation of international law. At the same time, Japanese trading firms and oil companies reportedly purchased Iranian oil that had become available when the United States banned oil imported from Iran. This action brought sharp criticism from the United States of Japanese government "insensitivity" for allowing the oil purchases and led to a Japanese apology and agreement to participate in sanctions against Iran in concert with other United States allies.