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It is not about where the marriage takes place - it is about where any divorce takes place.
If the divorce takes place in the Uk then the UK court has the power to ignore ANY pre-nup if the Judge does not believe it make proper provision for the spouses or any children
The strongest pre-nup in these circumstances would be one prepared and entered into in the Ukraine which is where the Lady comes from.
Please ask if you need further details
That depends on so many things - including what assets she has any provision for children.
However if it is in line with what would happen in Ukraine it will be easier to defend