Most probably this is a former Sovvier Army Aviation Mi-24R. It carries a manufacturer date of 6 November 1986. It was moved to the Ukrain Army Aviation on 6 December 1991. Then sold to the Sri Lanka Air Force as CH-629 and assigned to 9 9 Attack Helicopter Squadron at Hingurakgoda. It was reserialled to SAH-4408 and it made its last flight as such on 30 MAy 2006. Although not operational anymore, it received a new serial, SAH-629, by March 2012. The gunship is seen here in quite a good condition, stored with the Aircraft Engineering Wing, with seemingly a new tail rotor.