Hello my fiancee and I have been together for 6 years and live in portugal, we are planning to get married in either Portugal the UK or Ukraine.

Basically I would like to know if we get married in Ukraine if the marriage would be viewed as valid in the UK if we were to live here at some point, and if we did divorce one day what countries laws would apply?

Also I would like to adopt my fiancees daughter, (she has sole parental responsibility), and for us to all have the same surname.

Any help or reccomended contacts would be much appreciated.