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How can a foreigner get an USA visa in Istanbul?

Hello my beloved and most helpful IN members, or, as my Colombian friend says, my Wikipedia for expats :-).
I am planning to .attend a conference in the USA at the end of March and I need a visa because I am a Russian citizen. Has any of you, being a foreigner, done it here in Istanbul? Do you have any advice where I should start my inquiry? Do you know how long it takes to obtain the visa?
Any advice is highly appreciated!
Enjoy the snow of Istanbul while I am enjoying the tropical son of Colombia :-).

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