Regarding Cassadia's extra-regional activities, quite so In a geopolitical sense (at least officially on the surface that is). Though I would not consider that to be the case in the department that is international trade. While around 70% of Cassadia's exports are to nations within the geographical confines of the Krillin region, that does not mean the other 30% are not just as important. One of the upsides of globalization is that, because the world is so interconnected, especially when it comes to trade and international exchange; these ''tools'' within the policy kit of either international organizations or world powers are more or less useless, unless they are applied on some small, weak nation with either a regime that is on unstable or vulnerable politically in its foundation.
I would like you to ask yourself this; how do you think all those influential people drive around in G-Wagons? or how Empress Relena's state car is the latest custom-built model of a Rolls Royce Phantom, not to mention the armored Cullinans of her Royal Guard that shadows her wherever she has to step outside the boundaries of her estates or the Carthage Palace?
Front-men, shell companies, shady proxy financial banking accounts in Caribbean-type island nations with zipped-lip financial confidentiality policies. That's how most of these goods find themselves in the Holy Kingdom, just like the status-symbol automobiles, the same goes for much smaller products, like the famous brand of cosmetics, designer clothes, alcohol, tobacco, or electronics (i.e iPhones, iMacs).
The same mindset can be applied to; how the various sectors of the manufacturing industries, especially those of strategic and national security importance or military-industrial complex are still somehow able to obtain the latest in CNC machines, 3D printers, or industrial robots - despite painstaking, exhaustive, and comprehensive sanctions regime that forbids pretty much everything save for everyday essentials (mind you those also still have to be signed off on) on the part of the WA.
The answer lies in smuggling (especially when it comes to conducting import or export activities outside Krillin), which for your interest, is
legal and approved of on a national level. Dare I say even directly supported (often with assistance by operatives of the General Reconnaissance Bureau), especially when the Crown-Government wants to acquisition certain kinds of goods that often with military applications; in that case, these often being sophisticated dual-use goods, be it electronics or industrial machinery, or actual military technology
especially if it pertains to the manufacture of hypersonic missiles, scramjets, nuclear propulsion systems, target acquisition guidance systems, artillery platforms, aircraft, SAMs, ECM equipment, RADAR, etc.
Such intricate smuggling schemes are almost always done by the General Reconnaissance Bureau; this is no easy feat as a mountain of export controls, government policy, and other bureaucratic hurdles have to be circumvented to get the cargo going, often these methods include bribes, falsified procurement orders from either national governments or companies as well as impersonating representatives from these private or state entities, along with executing a more sophisticated version of the smuggling scheme regarding the one concerning civilian products and goods.
Some IRL examples of rogue states successfully obtaining often-sensitive products with substantial dual-use capability or just straight-up military technology, products, and systems.
Example 1Example 2Example 3Example 4Example 5Example 6