A few days after the US election, China's Xi Jinping gave an ominous warning to Obama - and to Trump

Pablo Martinez Monsivais/AP

President Barack Obama and President-elect Donald Trump after a meeting in the Oval Office, November 10, 2016.

• Donald Trump's election was greeted with dismay around the world, and numerous leaders expressed concern to President Barack Obama.
• During Obama's last foreign trip, Chinese President Xi Jinping warned about how the world would view "an immature leader."
• Trump has had rocky relations with China, even as he lavishes praise on Xi.

Days after Donald Trump won the 2016 US presidential election, Barack Obama left the country for his last trip abroad as president.

The trip took him to Greece, Germany, and, finally, Peru, where he attended the 2016 the Asia-Pacific Economic Cooperation summit. Throughout the trip, anxious world leaders greeted Obama, inquiring about the man who would soon occupy the Oval Office.

That sentiment was on display in Lima, where "Obama was pulled aside by leader after leader and asked what to expect from Donald Trump," former deputy national-security adviser Ben Rhodes writes in his memoir of his time in the White House, "The World As It Is."

Obama advised them to give the Trump administration a chance, telling them to "wait and see," Rhodes says.

REUTERS/Greg Baker/Pool

President Barack Obama and Chinese President Xi Jinping toast at a banquet in the Great Hall of the People in Beijing.

The trip featured a sit-down meeting between Obama and China's president, Xi Jinping.

Two years before, the two had met in China, where Obama secured Xi's cooperation to address climate change, which in turn made the Paris climate accord possible.

Xi told Obama - unprompted, Rhodes says - that China would implement the Paris accord even if Trump abandoned it.

Obama called that decision wise and said Xi could expect "states, cities, and the private sector" in the US to continue investing in the accord, even if the federal government reneged.

As the meeting came to an end, Xi asked about the leader who would soon take over in Washington. Obama repeated his advice to wait and see, but, he added, Trump had rallied US voters around real concerns about economic relations with China.

"Xi is a big man who moves slowly and deliberately, as if he wants people to notice his every motion," Rhodes writes. "Sitting across the table from Obama, he pushed aside the binder of talking points that usually shape the words of a Chinese leader."

"We prefer to have a good relationship with the United States," Xi said, while folding his hands in front of him, Rhodes writes. "That is good for the world. But every action will have a reaction. And if an immature leader throws the world into chaos, then the world will know whom to blame."

Carlos Barria/Reuters

President Donald Trump and Chinese President Xi Jinping at Trump's Mar-a-Lago estate in Palm Beach, Florida, April 6, 2017.

Rhodes did not elaborate on that interaction, but the months since Trump took office have been marked by rocky relations with the world, and China is no exception.

On more than one occasion, Trump has lavished praise on Xi, including calling him "a very special man" during a state visit to Beijing in November 2017 and complimenting his abolition of term limits earlier this year, saying, "He's now president for life ... and he's great."

Trump has even praised Xi amid the escalating trade fight between the US and China. That clash hit a new height on Friday, when Trump announced tariffs on billions of dollars of Chinese goods.

"In light of China's theft of intellectual property and technology and its other unfair trade practices, the United States will implement a 25 percent tariff on $50 billion of goods from China that contain industrially significant technologies," Trump said in a statement.

REUTERS/Thomas Peter

President Trump takes part in a welcoming ceremony with China's President Xi Jinping in Beijing.

China said its response to the tariffs would be immediate and that it would "take necessary measures to defend our legitimate rights and interest."

Countries around the world, especially US allies, continue to regard Trump with concern, uncertain of his commitment to longstanding alliances.

In China, his seeming withdrawal from the US's traditional role on the world stage is seen as an opportunity, according to former Australian Prime Minister Kevin Rudd, but not one without risks.

Chinese leaders "see vacuums and spaces opening up around the world," Rudd said in May. "The Chinese see this as an opportunity to frankly - I won't say exploit American weaknesses - but simply to move into vacuums."

"Here's the qualifying point," Rudd cautioned. "They find Trump strategically comforting and tactically terrifying, and why do I say that? Tactically terrifying because they actually do not know which way he will jump."