if the raison d'etre behind the formation of the European Union was common economic benefits vide a combined European Market for all the members, then the glue which can provide the much needed adhesive today to it, would be the common threat from terrorist attacks.
The EU should view the dastardly attack in France as an attack on it as a whole, and should form a combined front against terror emanating from any part of the world.
Indian diplomacy should adopt a proactive approach, of being a key catalyst in this united front against terror to EU, by providing them vital inputs on terror. Yes, this should be a highly subtle diplomacy without any grand public statements.
The dividends from such a diplomatic initiative can be easily guessed.