(Image Entertainment and Imagine Entertainment seem to be separate companies.)
Update: March 15, 2014
Rewatched, the film had not made enough of an impression for me to remember.
Today it seems more relevant, given Putin's recent behavior, that an assassin could be a double agent for the Russians today. At the end, the conversation in Russian between Geary and Sheperdson sounds bizarre, like the Russians were planning to plant a community here and tale over the country.
In fact, it's possible to imagine that Putin would place double agents like these characters (after all, they both are such) in the Ukraine or Crimea today; maybe other NATO countries.