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I'm guessing it was Russia; SVO is SU's hub, which is a SkyTeam member.
A further clue is that the OP didn't need a schengen visa, but would have needed a visa to leave the airport at the transit point. This would be consistent with, for example, a USA passport. I don't know whether the same would be true for a Singapore passport.
ADDED: It might have been IST, depending on the OP's passport (with visa on arrival for a fee applying for USA passports), but my guess is that the spouse would not have been able to enter Turkey without a visa granted in advance if a Schengen visa was necessary.
Last edited by MSPeconomist; Mar 27, 2021 at 5:19 pm