The Ukraine reference was referring to Russia annexing part of it, and the rest of the world doing nothing. As I said there might be technical legal difference

The Ukraine reference was referring to Russia annexing part of it, and the rest of the world doing nothing. As I said there might be technical legal differences, but practically speaking at this level they can be ignored. If Texas wants independence, it isn't going to be put off by US laws. The US will loudly point to those laws yes, but whether it does anything will be independent of those laws.