Diplomacy CAN be used for Krishna, but don’t try it unless you’re expert and there’s a good reason for it. “The conclusion is that diplomacy used for the service of the Lord is a form of devotional service.” (Caitanya Caritamrta, Madhya-lila, Chapter twelve, verse 44, purport). Diplomacy or kutaniti, is sometimes translated as “duplicity.” But both Raghunatha das and Sanatana were familiar with diplomacy and used it when necessary.