Cambodia's King Norodom Sihamoni (R) greets President of Senate Chea Sim as President of the National Assembly Heng Samrin (L) smiles upon Sihamoni's arrival at the Phnom Penh international airport August 18, 2012. Sihamoni returns home after he visited China for a medical check-up and to meet his parents according to local media. REUTERS/Samrang Pring (CAMBODIA - Tags: SOCIETY ROYALS POLITICS)