This means Japanese imports of liquefied natural gas from Russia's Sakhalin-2 project and elsewhere could be affected.Shipowners have to sign up for extra war damage insurance before sailing through Ukrainian and Russian waters.Before this, shipowners were obliged to conclude with insurers additional agreements to cover war damage risks for sailing in Russian or Ukrainian territorial waters.Navigation was partially resumed due to the Grain Initiative on deliveries of Ukrainian cereals to the most vulnerable parts of the world.Photo: Getty ImagesLet’s get started read our news at facebook messenger > > > Click here for subscribe"