Addressing the East Asia Summit in Cambodia, Biden said the United States would compete with China and speak out over its human rights record, but stressed the importance of peace in the Taiwan Strait and ensuring freedom of navigation in the South China Sea.
On China, Biden told the summit that "the United States will compete vigorously.... while keeping lines of communication open and ensuring competition does not veer into conflict," the White House said in a statement.
Eighteen countries accounting for half the global economy attended Sunday's East Asia Summit, including the ASEAN nations, Japan, South Korea, China, India, the United States, Russia, Australia and New Zealand.
"The United States and its NATO allies are trying to master this space," Lavrov told a news conference in Phnom Penh.
Like ally the United States, Australia's ties with China have also deteriorated in recent years.