The "official" private visit to Hanoi

Cambodia's former king Norodom Sihanouk (L) greets officials before his plane leaves for a private visit to Vietnam at the Phnom Penh International Airport June 22, 2010. REUTERS/Chor Sokunthea

Cambodia's government officials send off former king Norodom Sihanouk, former queen Norodom Monineath Sihanouk and King Norodom Sihamoni for their private visit to Vietnam, at Phnom Penh International Airport June 22, 2010. REUTERS/Chor Sokunthea

Cambodia's Prime Minister Hun Sen speaks to officials while waiting to send off former king Norodom Sihanouk and queen Norodom Monineath Sihanouk for their private visit to Vietnam at Phnom Penh International Airport June 22, 2010. REUTERS/Chor Sokunthea