Richard Heydarian is an Asia-based academic, columnist and author of "The Rise of Duterte: A Populist Revolt Against Elite Democracy" and the "The Indo-Pacific: Trump, China and the New Struggle for Global Mastery."
Cowboy diplomacy will further weaken the 10-member bloc's key principles


Hun Sen waves from a plane before heading to Myanmar at Phnom Penh International Airport on Jan. 7: when it comes to Hun Sen's ASEAN leadership, it rhymes. © AKP/AP
Richard Heydarian is an Asia-based academic, columnist and author of "The Rise of Duterte: A Populist Revolt Against Elite Democracy" and the "The Indo-Pacific: Trump, China and the New Struggle for Global Mastery."