@Dave - thanks for that article, it finally gives a "reasonable" routing (wasn't a direct flight to Moscow nor a charter between Martinique and Guyane but a Cayenne - Fort de France - Orly flight, which makes a lot more sense !). And there was a significant number of Russian paxes on board (maybe code sharing ?).
As for the ATC instructed RTO the jury is still out... it might very well end up being a pilot initiated one having detected some trouble during the roll out.