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Do you have any more photos of this individual which show whether it has a wing-bar and central crown stripe - details of the leg colour would also be helpful. There are some other eastern Phylloscs which this might just be, which cannot be discounted from this single photo.
This could be an Arctic Warbler, but I don't think other species can be ruled out.
I think the bill length rules out Greenish and Two-barred Warbler although Eastern-crowned Warbler can't be ruled out
Unfortunately I do not have another photograph of this bird. Sorry
Unfortunately I don't think Eastern Crowned Warbler can be ruled out, so it is unlikely that this record can be agreed - if you submit it as Phylloscopus sp, then I'll agree it.
Lat/Lng: 1.342, 103.7278