The blockade was imposed by the UNC since November 1, 2016.
The blockade was imposed by the United Naga Council on November 1 to protest against the creation of seven new districts.
The Union home ministry said there was 'substantial progress' on the issues in the talks.
The tripartite agreement was signed by Assam Chief Minister Sarbananda Sonowal, top leadership of the four factions of the NDFB, ABSU, Joint Secretary in the Home Ministry Satyendra Garg and Assam Chief Secretary Kumar Sanjay Krishna in presence of Union Home Minister Amit Shah.
The Aam Aadmi Party on Thursday released its first list of 22 candidates fielding former ministers Somnath Bharti, Saurabh Bhardwaj, Satyendra Jain and Girish Soni in the Delhi Assembly elections, the dates of which are yet to be announced.
Chief Minister Sarbananda Sonowal said the "historic day will remain etched in their memories forever".
The Union home ministry termed the suspension as null and void.
