Canada was the first Western country to legislate the possibility of seizing sanctioned Russian assets for Ukraine's reconstruction.
This is the first practical step toward seizing Russian assets abroad and using them to rebuild Ukraine. Candidate of legal sciences, director of Dnistrianskyi Center, Ivan Horodyskyi, and Vice-Rector of the Ukrainian Catholic University, Dmytro Sherenhovskyi, write in their article Canadian Precedent: How Seized Russian Assets to Help Ukraine.
Now, this doesn't say if it would consider assets owned by oligarch Russian assets, but considering other countries have been seizing assets owned by oligarchs I would think so.
A multinational task force designed to seize Russian oligarchs’ wealth has blocked and frozen $30 billion in sanctioned individuals’ property and funds in its first 100 days in operation, the Treasury Department reported Wednesday.
Since most Chinese CEOs and investors aren't part of the Chinese governments, would this precedent still imply the same treatment against them in the event of a war, and what are the legal implications of such a move is only limited to Russians even if China were to attack Taiwan.