You can buy the Pocophone F1 in the US, but you probably shouldn't
Xiaomi Pocophone X3 NFC 64GB / 6GB RAM 6.67" 64MP 4G LTE GSM Factory Unlocked Smartphone - Global Model - Blue - Walmart.com
Amazon.com: Mainboard PCB Circuit Module Board Replacement Fit for Full Working for Xiaomi Pocophone Poco F1 Motherboard 6G+64G 6G+128G 8G+256G Unlocked Logic Board MainboardReplacement Mainboard(Color:6GB RAM : Electronics