WASHINGTON: Secretary of State Antony Blinken said Wednesday that the United States was ready to confront China wherever necessary, calling Washington's ties with the Asian power the "biggest geopolitical test" of the century.

In his first major speech, Blinken promised that President Joe Biden's administration will prioritize diplomacy over military action and build cooperation with the world on global challenges such as climate change and Covid-19.

"We will manage the biggest geopolitical test of the 21st century: our relationship with China," Blinken said at the State Department.

He vowed to champion the rights of Hong Kong and the ethnic Uighurs, saying that if not, "China will act with even greater impunity."

"China is the only country with the economic, diplomatic, military and technological power to seriously challenge the stable and open international system -- all the rules, values and relationships that make the world work the way we want it to," he said.

"Our relationship with China will be competitive when it should be, collaborative when it can be and adversarial when it must be. And we will engage China from a position of strength."