You cannot do ANYTHING without consequence, why would that be a criterion for anything? And ownership is a legal fiction, hence why Russia was able to seize all those passenger planes, likewise with Western nations seizing the assets of Russian oligarchs. Ownership, particularly of intangible things like debt, is not some universal truth or force of nature like gravity: it's an emergent property of the system we have set up. One of the reasons why the UK is (or was) the centre of finance was because of its robust legal system that puts an extreme emphasis on property rights. And that's a deliberate decision. The idea that such a decision is amoral is ridiculous.
> There is not a real concept of trust like between individuals
Yes, there absolutely is? In fact, it is the currency of international relations. International law isn't even really a thing: international law is domestic law; it only exists to the extent that a country respects the Rule of Law. It's why certain countries that blatantly violate international law face no legal consequence. It's why the response to the violation of international law are sanctions, not a higher courts overruling them: there is no higher court. And even when there are hypothetical higher courts, like the ECJ, again it only works so far as the member state is willing to play along, which is partly why Hungary is in such hot water with the EU. I'd even go so far as to say that nations rely on trust more than people do. The fact that you don't think trust even a concept with nations is wild and makes me doubt whether you understand the concept of international relations at all. And all this is also true within a nation: if you cannot trust your state institutions, those institutions are worthless.
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I do not think it is worth conversing further since this is clearly unproductive.