Ubon Ratchathani is one of the four main cities in Thailand's Isan region, alongside Nakhon Ratchasima, Udon Thani, and Khon Kaen, collectively known as the "big four of Isan." From Wikipedia
A leaked phone call with Hun Sen prompted the Bhumjaithai Party to quit the coalition, imperiling Paetongtarn Shinawatra’s government.
