Well Robert described exact what it is.....you got a non o in Russia , coming to thailand you need to extend it to one year ...it's the best to go to phuket town again, ask the volunteers what's to do , you can extend it here and don't need to go out every 90'days...as Robert described you need to ask them ...
Well on Phuket they Accept a mixture or....bank and " income of money " as well ....as some embassy or consulates don't give out a letter of income anymore.....
Well very easy..take ist to the Bangkok Translation For example to make their "Stamp " it a certificated translation office very close to the intersection up to the rang hill....it's not enough by a foreign office ...but they are easy and you get it