NSCN Chairman Isak Chisi Swu and General Secretary Thuingaleng Muivah has been blaming the Centre for the delay for the delay in finding a solution to the six-decade-old Naga problem.
The Naga insurgency was India's first ethnic rebellion. The dispute has claimed around 25,000 lives for more than 55 years since 1950s.
The NSCN are seeking the creation of a 'greater Nagaland' by uniting the Naga-inhabited areas of Manipur, Assam and Arunachal Pradesh. They are also pitching for sovereignty for Nagaland.
However, the other northeastern states are vehemently opposed to the idea of creating 'greater Nagaland'.
According to media reports, Prime Minister will present a 29-point proposal to hammer out a solution to the Naga problem.