Taxation on ETFs with Swiss bank, tax residency in Thailand

Hey,
I am curious to hear your opinions on this. I hold a European passport, but have my (only) tax residency in Thailand. I hold a swiss bank account with which I am considering to buy ETFs. However, I am confused about the tax situation. Specifically, Thailand has a tax law in place where foreign sourced income is not taxed as long as it isn't brought to Thailand in the same fiscal year. Does this apply for capital gains also? I.e., if I earn $10k from my ETF position in Switzerland - Will I be liable to pay tax in Switzerland as a non-resident (I belive 35%), or will I be able to play around the fiscal year taxation rule in Thailand somehow?

SwissQuote

uplana said:

Do you already know the Swiss bank with who you want to open a bank account? For me it sounds like mission impossible what you want to do there!

Do you know how tax liability would be enforced in this example?