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Thriller, 80s or 90s, Eastern European martial arts expert kidnaps a couple

A thriller, not well known, probably made in the late 80's or early/mid 90's, probably not an American film, possibly British?

A couple makes friends with an Eastern European guy who knows martial arts -- in one scene as the three are walking outside (down a street? through a park?) he kicks really high, knocking a leaf in a tree.  

He starts out nice and soon turns chillingly bad after having kidnapped the couple -- it's clear they can't do anything, the boyfriend is totally out-aggressed.  The plot is fairly twisty -- it's possible the girlfriend turns out to be partners with the bad guy... not sure about that though...
asked Jun 18, 2015 in Name That Movie by LMNT5 (1 point)
Was there a lot of martial arts in it? If I am reading right, it is in english, just not american?
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