'America is back,' Biden says in first diplomatic speech, touts muscular foreign policy

US President Joe Biden on Thursday promised a new era after the scattershot foreign policy of his predecessor, Donald Trump, declaring "America is back" on the global stage in his first diplomatic address as president.

In his speech, Biden signalled aggressive approaches to China and Russia, urged Myanmar's military leaders to halt their coup, and declared an end to US support for a Saudi Arabia-led military campaign in Yemen.

"American leadership must meet this new moment of advancing authoritarianism, including the growing ambitions of China to rival the United States and the determination of Russia to damage and disrupt our democracy. We must meet the new moment ... accelerating global challenges from the pandemic to the climate crisis to nuclear proliferation," said Biden.

Trump angered European and Asian leaders with tariffs, fracturing of global alliances, and threats to withdraw US troops. He did little to push back against a wave of authoritarianism in some countries.

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After a Trump-inspired mob attacked the US Capitol on Jan. 6, protesting Biden's election win, foreign allies and rivals alike expressed doubts about the health of American democracy.

Biden's speech on Thursday was a full-throated attempt to vanquish those doubts, and convince Americans of the value of a forceful international approach.

"Investing in our diplomacy isn't something we do just because it's the right thing to do for the world," he said. "We do it in order to live in peace, security and prosperity. We do it because it's in our own naked self-interest."

Biden's choice of the State Department as venue for his first big diplomatic address was an important symbol of the value he places in career diplomats, who Trump largely saw as opponents.

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"American alliances are our greatest asset. And leading with diplomacy means standing shoulder to shoulder with our allies and key partners once again," Biden said.

Biden in his early days has attempted to repair what he has called the damage to America's standing around the world, rolling back Trump policies. He is working to revive the Iran deal, and renewed US membership in the Paris accord and the World Health Organization.

He challenged Russian President Vladimir Putin.

"I made it clear to President Putin, in a manner very different from my predecessor, that the days of the United States rolling over in the face of Russia's aggressive actions, interfering with our elections, cyberattacks, poisoning its citizens, are over," he said.

Trump had initially sought a warm relationship with Chinese President Xi Jinping but differences over trade, Hong Kong and what the US military calls Beijing's destabilizing and aggressive behavior in the South China Sea prompted a rift.

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China, which is expanding its military and working to grow its influence around the world, is perhaps Biden's biggest international challenge as he begins his presidency. He called Beijing "our most serious competitor."

"We'll confront China's economic abuses, counter its aggressive, coercive action to push back on China's attack on human rights, intellectual property and global governance. But we're ready to work with Beijing when it's in America's interest to do so," he said.

Not all US allies may be happy at the sharp turn in US foreign policy, including Poland, where Trump once pledged to deploy US troops, or a host of nations that have criticized heavy-handed intervention by Washington in the past.

"We are a country that does big things. American diplomacy makes it happen and our administration is ready to take up the mantle and lead once again," said Biden.