New Delhi: Prime Minister Narendra Modi on Tuesday condoled the death of veteran Naga rebel leader Isak Chisi Swu and lauded the role of the Chairman of the National Socialist Council of Nagaland (Isak-Muivah) faction for "bringing out" the Framework Agreement for Naga peace signed between the central government and the rebel outfit. "My heartfelt condolences to the family and supporters of Mr. Isak Chisi Swu on his demise. May his soul rest in peace," the Prime Minister tweeted. "Mr. Swu will be remembered for his historical role in bringing out the Framework Agreement for Naga peace," he said in another tweet. Modi also wrote on the microblogging site: "Mr. Isak Chisi Swu wished the best for the Naga people and aspired for peace." On August 3, 2015, the central government signed the Framework Agreement with NSCN(IM). While the government’s Interlocutor for Naga Peace talks, R.N. Ravi, signed the agreement on behalf of the Centre, Chairman Isak Chishi Swu and Thuingaleng Muivah, General Secretary of NSCN(IM) and long associate of Swu, were the signatories on behalf of the Naga group. Swu had to miss the signing ceremony at Prime Minister's official residence due to his ill health.