Prior to the military defeat of the LTTE, he was the international legal advisor to the organization's supremo Velupillai Prabhakaran and in-charge of its international &amp; diplomatic affairs. Rudrakumaran made valuable contributions to the LTTE, including coordinating lawyers in the defense of Rajiv Gandhi assassination case, assisting in Suresh Manikkavasagam trial in Canada and challenging US decision to name LTTE as a Foreign Terrorist Organization in 1997. He has represented the LTTE in several peace talks with the Government of Sri Lanka.