NEW DELHI, April 30: Centre and the National Socialist Council of Nagaland (Khaplang) have formulated a 15-point charter of 'dos and don'ts' to enforce ground rules for ceasefire in the State which came into effect on Saturday, a Home Ministry spokesman said today, reports PTI. Under the accord, NSCN(K) would not undertake offensive operations like ambush, raid, sniping and killings or cause damage to property of the security forces and civilians. The security forces, in turn, would not attack NSCN(K) cadres but would reserve the right to continue operation against all other militant groups...