Sarawak took Petronas to court in November, saying the national oil company was the only energy company operating in the state that had not paid the 5% state sales tax that was imposed on Jan. 1, 2019. Malaysia's Sarawak and Sabah states - both located on Borneo island and holding much of the nation's oil and gas reserves - have long asked for higher royalties from Petronas. Petronas is sole manager of Malaysia's energy reserves and a significant revenue source for its only shareholder, the federal government. (Reporting by A. Ananthalakshmi; Editing by Tom Hogue)