Just briefly, countries can do whatever they want. There's nobody above Ukraine and Canada saying when the final moment is. Once it has been ratified and royal assent has been achieved, then, yes, the treaty law would say that's when it comes into force, but until that moment, we can do whatever we want, and in the case of CETA, we did. A year after it was initially signed, the ISDS section was pulled out and replaced by an investment court system and then resigned. That happened in the USMCA as well—the CUSMA—when Democrats were opposed to some of the long data protection terms on biologic drugs, so those were changed on the American side and then it was kind of repackaged.
It's possible.