The United States had completely lifted the embargo on trade in arms with Vietnam, President Barack Obama said in Hanoi earlier on Monday, an overture that should enable an old foe to boost its defences at a time of rising South China Sea (Vietnam's East Sea) tension.
Obama said the sale of arms would depend on Vietnam's human rights commitments.
Chinese Foreign Ministry spokeswoman Hua Chunying made the remarks on China's hopes for U.S.-Vietnamese ties when asked about the lifting of the arms embargo.
China resents U.S. efforts to forge stronger military bonds with its neighbours amid rising tension in the disputed South China Sea (Vietnam's East Sea).