SWIFT is an international financial system, not an "American" one. It was started in 1973 by 239 banks from 15 countries. It's always been headquartered in Belgium, not the US, and it now includes nearly every country in the world except of course Russia and its similarly sanctioned authoritarian pals. Taiwan, as well as most other countries, have cut off Russia from SWIFT of their own volition. In Taiwan's case it was largely due to the fact that Russia's unprovoked attack didn't go well with the Taiwanese people who's been living under the fear of invasion by China for decades.Oops again! <more nonsense follows>
I'd go into more detail, quotes and sources to get the Russian propaganda out of your head, but it's not the place for such discussion, so I'm done here. Feel free to raise the question on Reddit (/r/ukraine is a good place to start) or learn to google these things yourself.