US to Asia will be literally a backup routing, since that the best routes between Japan and western US coast are already continuously constructed and maintained. EU and Japan would be godsend, the best direct link would be through China, which is politically and practically (even with the best of diplomatic relations, terrestrial cable linking is much more complicated due to mountains, rivers and other obstacles) impossible. Although there's an EU-Hong Kong terrestrial link operated by RETN, it's a relatively low-bandwidth link compared to the aggregate of all Japan-Singapore-Marseille links, so if this a high-bandwidth link it'll be a boon.