July 18 (Reuters) - Ptt Exploration And Production Pcl PTTEP.BK
* Refers to news in relation to the lawsuit pursued by Indonesian government concerning the Montara incident
* Received claim filed by ministry of environment & forestry of Indonesia seeking about usd 2.1 billion for damages
* Company will proceed to defend against lawsuit
* No oil from Montara reached shores of Indonesia or Australia and no long-term damage was done to environment in Timor sea