. Photo credit: Vietnam News Agency The Ministry of Foreign Affairs condemned China’s illegal construction work on Gac Ma (Johnson South Reef) in Vietnam’s Truong Sa (Spratly) Islands as a “serious violation of Vietnam’s sovereignty.” During a press briefing held Thursday, MOFA spokesman Le Hai Binh said Vietnam had sufficient legal and historical proof to assert its sovereignty over Truong Sa. Unilateral action intending to change the status quo in this area seriously violated Vietnam’s sovereignty and complicated the East Sea and regional situation, he added. Recently, a BBC report documented a Chinese project to dredge tons of rock and sand from the sea floor to pump into the Johnson South Reef. The works appear to have been going on for months, according to BBC. In May the Philippines released photos that appeared to show Chinese land reclamation efforts on Johnson South Reef, saying China appeared to be building an airstrip. When asked about the recent anti-Vietnam demonstrations in Cambodia, MOFA spokesman Binh said Vietnam has continuously called upon the Cambodian authorities to implement measures to prevent illegal actions, which prove to be inconsistent with the traditional friendship between the two countries.