I won't say they were an western ally, western leaning is the right term. Post Euromaidan pro Russian government was ousted but still the new government didn't outright declare for one side. Post occupation of Crimea did the west and Ukraine come closer, Ukrainian army based on western lines and reformed as a whole. Western support in terms of Arms and equipment on a large scale didn't begin Post 1yr of the invasion.
As for the second part pf the comment I would like to say that the current world order is based on multipolarity and multi lateral trade arrangements. China is part of the same order (WTO/Marrakesh agreement). It encompasses all treaties and obligations member states are eligible for. China had to wait a lot to finally be accepted in WTO, it's due to WTO that developing countries like China and India had such a good growth spurt. And its dominated by the likes of developed/ Bretton woods institutions.
America has moved to Post developed services economy where they have outsourced their Industries and backend services to developing economies. China will reach a similar deadlock in the near future. Japan and SK have already reached it.
Taiwan is independent i believe, they have a national consciousness as a Nation.