Supporters of the Cambodian National Rescue Party (CNRP) arrive at a Cambodia-Vietnam border

SAMRANG PRING, Reuters, 19th July 2015

Cambodian soldiers stand guard as supporters of the Cambodian National Rescue Party (CNRP) arrive at a Cambodia-Vietnam border during a visit led by the party in Svay Rieng province July 19, 2015. Lawmakers from Cambodia's opposition party led around 2,000 people on Sunday to a Vietnam border site that was the scene of recent clashes. Members of the opposition CNRP are known for protesting against close ties between Phnom Penh and Hanoi, and have organised protests along the 1,270 km (about 789 miles) border in the past. The border is not fully demarcated and has caused confusion in the past. REUTERS/Samrang Pring

Supporters of the Cambodian National Rescue Party (CNRP) arrive at a Cambodia-Vietnam border during a visit led by the party in Svay Rieng province July 19, 2015. Lawmakers from Cambodia's opposition party led around 2,000 people on Sunday to a Vietnam border site that was the scene of recent clashes. Members of the opposition CNRP are known for protesting against close ties between Phnom Penh and Hanoi, and have organised protests along the 1,270 km (about 789 miles) border in the past. The border is not fully demarcated and has caused confusion in the past. REUTERS/Samrang Pring