The movie as a metaphor for Russia wanting Ukraine?
Milla is a Russian speaking woman of Ukrainian ancestry, so that part immediately works. From the trailer I see that her initial fiancee was rude, boorish, a klutz, and someone who didn't appreciate her. So, he would represent the European Union.
Kolotilov is Russia, a totally innocent party who gets harmed by the rush of Ukraine/Milla and her fiancee/The European Union to leap into an ill fated marriage.
The movie shows that Milla's character and Kolotilov are meant to be with each other but the world keeps throwing obstacles at his making it to the wedding. This could be a metaphor for Russia saying "Be patient, we know you want this to happen; we're trying as hard as we can!".
I'm a huge fan of Milla and I'm sure she didn't read the script this way. Only recent events expose the possibility of my theory having any merit.