The problems are mostly in business administration. A Japanese CA would need staff who can communicate in every foreign language that could be encountered in a

The problems are mostly in business administration. A Japanese CA would need staff who can communicate in every foreign language that could be encountered in a 'hostile' nation. And they'd presumably have to get those employees from the Japanese population, because otherwise if you hire all Turkisk nationals at a Japanese CA, what's the point? Then they'd have to be willing to accept payment in the currency of all the hostile nations, etc. Not to mention the difficulties of defining hostile nations. That would just further encourage countries like China and the US, which both want to intercept traffic, to negotiate with each other to get mutual access.