The exact very same as if China or India wants to sell into the EU or into the UK. It must comply with with either CE or BS (here British Standard) specification. Be it cars, 'phones, even toys for kiddies.
So whether in or out if you sell into marketplace X or marketplace Y you make your product to the legal standards requirement in that market or what is the common requirement there even if not legally specified. It is why US made cartridge tumblers sold into the UK are 240 volt not domestic American historic specification 11O volt.