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Another US diplomat overseas noted that in the short term, it will likely be 'relatively easy to restore a positive movement and atmosphere in our alliances, key relationships ... just by practicing normal good democracy,' but 'longer term, people know the US could swing back to Trumpism, so they're wary.'

The international welcome to Biden has been warm. As a longtime member of the Senate Foreign Relations Committee and a two-term vice president, Biden and his preferences for strong alliances and global economic integration are well known quantities overseas.

Despite the warm words, however, Washington's relationships with allies have been scarred in ways that might be hard to entirely heal.

Wary allies

The public image of the United States has plunged among wealthy democracies, with more people believing Russian President Vladimir Putin would 'do the right thing regarding world affairs' than Trump, according to a Pew Research Center survey published in September. In the UK, France, Canada, Japan, Australia and Germany, the number of people who viewed the US favorably are at or near lows not seen since the surveys began two decades ago.

And as Trump put his 'America First' foreign policy to work, many leaders decided it was time to curtail their reliance on the US.

'Many Europeans have written and argued that they cannot go back to the good old days of living under the US umbrella, during the last few years of Trump's term,' the US diplomat based in Europe said. 'What many Europeans learned from Trump especially is that the American president can claim their foreign policy agenda, no matter what the American people say.'

In 2018, French President Emmanuel Macron told ambassadors that France and Europe could no longer rely on the US for security, a warning he repeated even more starkly in 2019.

German Chancellor Angela Merkel also warned in 2018 that the European Union could no longer depend on the US, while core Asian allies, such as South Korea and Japan, suddenly found themselves faced with demands for up to 400% higher payments for the presence of US troops.

Former career US diplomat Lewis Lukens told CNN that Biden 'will need to immediately start rebuilding relationships and reestablishing trust in America. But that will be difficult as most allies and partners will be wary that 'another Trump' could be less than four years away.'

'I think many countries' faith in the US as a reliable partner have been shaken by the damage Trump has done, not just to US democracy and institutions, but to multilateral institutions as well,' he said. 'Trump still has two months in which he can inflict damage (even if temporary). And the reluctance to admit defeat and start a peaceful transfer of power is being noted with dismay by democratic allies and with barely concealed glee by countries like Russia, China, and Turkey.'

China

China could well be Biden's trickiest challenge. Biden has said there are areas where it is in the US interest to work with Beijing, including on climate change and North Korea. Biden advisors say he will work closely with allies to present a united front on issues such as technology, including Huawei and 5G, intellectual property theft, China's expansion in Asian waters and its moves to crush democracy in Hong Kong.

The US diplomat overseas stressed that it is a 'huge challenge,' and that Biden must build an actual coalition among European and other like-minded nations to confront those issues.

US allies are looking forward to working with the incoming Biden team on China, some say.

'The Biden team will be much more astute as to how you rebuild a coalition that reminds China that one of the biggest assets that the US has is global support, a network of allies and friends that is unrivaled,' said a senior diplomat from the region. 'The Biden team is fully aware that they are in a competition setting with China and that will be important, but that there are issues of mutual vulnerability like climate change that they need to address together.'

North Korea

Trump met with North Korea's Kim three times and gushed about the 'love letters' the dictator wrote him and how they 'fell in love.' None of that dissuaded Kim from continuing to develop nuclear weapons that can reach US soil, making North Korea a more dangerous threat at the end of the Trump administration than it was at the beginning.

Biden has said that he won't continue Trump's overtures to Kim. This position could strain the US relationship with South Korea, where Trump's openness to engagement with Kim was favored. Instead, Biden will work closely with allies and China in an attempt to rein in their nuclear program. Many US administrations have tried before, none have succeeded.

Iran

During a foreign policy speech last year, Biden said he would rejoin the Iran nuclear deal if Tehran starts complying with the pact, a move that advisers say will require close work with allies and a near immediate start of new negotiations.

After the Trump administration left the pact and launched its maximum pressure campaign, Iran announced that it would no longer limit itself to the deal's restrictions. Yet negotiating that re-entry is easier said than done.

'We will have to figure out how we are going to approach it and what we expect to see of Iran and how that gets communicated,' said a Biden foreign policy adviser, when asked about face-to-face meetings with Iran in order to get the US back into the JCPOA, and to push Iran back into compliance. 'I don't want to speculate.'

It will also require Tehran to play ball. While that's seen as likely in the near term, a lot will depend on how much power Iranian hardliners gain in the country's 2021 elections.

Given the complexity of the situation, it could leave allies frustrated if the US does not rejoin overnight.

'Some Europeans expect Biden will jump right back into the deal which is not exactly what he has said, and we are in a fundamentally different place,' said the US diplomat based in Europe.

'They may be disappointed.'

Afghanistan

Biden has clearly stated that he wants to draw down the US military presence in Afghanistan but doing that carefully will be a challenge and Biden's advisers have not offered details on how he intends to do it. That's partially because it's not clear exactly what sort of situation they'll inherit, they say.

During the Obama administration, Biden was one of the early US officials to acknowledge the need to work with the Taliban to deliver peace in Afghanistan, when he said in 2011 that, 'the Taliban per se is not our enemy.'

It is also unclear how, precisely, Biden will approach the US-Taliban direct talks that started under the Trump administration, which have been critiqued by some.

Yemen and Saudi Arabia

Biden would end support for the Saudi Arabia-led intervention in Yemen, which many in Congress oppose because of reports of ongoing and serious human rights violations. This is a major policy push from the progressive arm of the Democratic Party and is a commitment that was added to their party's platform earlier this year.

But even if the Republicans maintain control of the Senate, most believe that Biden will be able to accomplish this goal, as it has GOP support as well.

'This is a fairly settled question,' Matt Duss, Sen. Bernie Sanders' foreign policy adviser, told CNN. 'With regard to Saudis in Yemen, Biden can say Congress has weighed in on this and I am following through.'