Japan is seeking to propose the establishment of international rules in response to infection-hit cruise ships, after its dealings with the U.S.-operated, British-flagged ship that was quarantined in Yokohama in February shed light on new legal issues, officials said Monday.

Japan took care of the around 3,700 passengers and crew aboard the ship Diamond Princess, including conducting coronavirus testing and treating them, although there was no uniform international law on what roles each related country should assume when nationalities of the ship and the operator as well as the country where the ship stopped at differ, they said.

The Foreign Ministry has requested some ¥40 million in the budget for fiscal 2021 starting next April for research into clarifying state liabilities in dealing with infection-hit cruise ships involving multiple countries, they said.