Very difficult to deal with Gulf Arabs. Even petronas got whacked at its penggerang oil and gas hub as Saudi failed to commit for their portion and eventually walked out.
And in klcc, Abu Dhabi wealth fund walked out of a extension to klcc mall, a 50 storey raffles hotel, 70 storey Citi towers. For a few years it was a hole in the ground for the supposed basement car park. It's noe covered with tiles and part of a park.