Here are some other related terms:
* Diplomasiya (Diplomacy)
* Embahador (Ambassador)
* Konsul (Consul)
* Tungkulin (Duty)
* Pakikipag-ugnayan (Engagement)
* Pakikipag-usap (Negotiation)
You can also use "maingat" (cautious) or "matalino" (wise) in some contexts to convey the idea of being diplomatic.