You can think of us as a New Faction of Sirius, yes. We've been here before but only recently have we began to show ourselves more often.
As for the diplomacy issue here, you won't have to worry about us. We are hostile to the Gallic Royal Navy, but we are not terrorists... meaning we do not attack everyone that has ties with our enemies, and i personally believe that harming the KTA wouldn't help our fight against Gallia... We will fight our battles without jeopardizing the safety of any civilian, no matter which side they're from.
As for visiting Kyushu, we're happy for the invitation. We'll pass by your system sometimes and see if we can find some work to do there.
I bid you farewell and wish you a good day Mr. Takeda.