2 Aeroflot flights a day from Moscow SVO to Phuket. From 60k to 231k roubles. If they fly multi class, the capacity will be lower. But
"Please note that, for reasons beyond the control of Aeroflot PJSC, we no longer accept VISA, MASTERCARD or JCB cards issued by banks outside the Russian Federation."
About $1000, £880 one way, 9 hour flight.