But on Earth we have both intercontinental communications and a well developed system for conveying diplomatic messages and personnel unmolested through third countries, even if they are unfriendly to either or both of the parties to the diplomatic exchange.
In Aurora, a system in between your embassy and your homeworld can very suddenly develop a really bad case of unfriendly naval forces that interdict your shipping, diplomatic or otherwise. I don't think it's reasonable for your friends on the other side of the blockade to take it as a deliberately unfriendly act that you don't run a jump point blockade to maintain your consular services.
(Also, simply pulling consular services and embassy personnel would be considered rude but probably not a sign of unfriendly intent, unless you simultaneously started repatriating your other nationals in the country. Obviously if you start repatriating every one of your nationals you can get your hands on, the other guy is going to wonder what it is you want to protect them from. But that distinction requires a level of granularity in the simulation of the civilian economy that Aurora does not currently support.)