BANDAR SERI BEGAWAN, June 4 (Reuters) - Brunei's ruler announced a major cabinet reshuffle on Thursday, creating new key portfolios and appointing two of his younger sons as ministers, in a sign of potential succession planning in the tiny oil-rich sultanate.

The shake-up is the first since 2022 and comes as Brunei, on the island of Borneo, faces pressure from a global energy crisis sparked by the U.S.-Israeli war on Iran.