China is demanding Vietnam to do more to protect Chinese nationals amid anti-China protests in Vietnam sparked by an oil rig in disputed waters in the South China Sea.
Beijing is urging Hanoi to take tougher measures to quell the violence.
It evacuated thousands of Chinese nationals from Vietnam following the attacks that killed at least two people and injured dozens.
China has reportedly sent two chartered flights and five ships to the region.
"We sent our best crew men to Vietnam for the evacuation."
A country heavily reliant on foreign investment, the Vietnamese government has called for an end to the protests.
Businesses and workers affected by the unrest have criticized the local authorities for their lax response, accusing the police of arriving too late or in insufficient numbers.
Vietnamese police have a reputation of blocking such demonstrations before they can take place.
Anger spread and protests of hundreds took to the streets of Vietnam's major cities after a state-run energy firm from China towed an oil rig in waters claimed by both China and Vietnam.
This recent spat is the worst since a border dispute between the two countries in 1979.
Kim Ji-yeon, Arirang News.