According to an article that was just released on the military news site defencenet, the assassination was to be executed by Greeks and come into effect a few days after a random block was made by a Russian task force (on a wire-tapping). The agents were in Greece to ensure that there was confidentiality of communications between Karamanlis and Russian President V.Putin on an emerging energy deal, as well as a sale on the supply of TOMA VMP-3HEL weapons systems.
The article on defencenet also claims that a document by Greece's intelligence service EYP contains the findings from Russian intelligence, according to which note that "the current generation of terrorists in Greece are controlled by Western intelligence agencies."
The location would have been executed at some point when the former Prime Minister was on route to his office in Athens.
(Read more details about the assassination attempt at this link)
Read Tuesday's story on this issue here
GOOD REPORT ON SKAI CHANNEL ON THE ASS. ATTEMPT, 5 MINUTES INTO THE VIDEO