The relationship between US President Barack Obama and German Chancellor Angela Merkel has come a long way.
A rift emerged between the allies in 2013 over revelations that US spies had been monitoring Chancellor Merkel's mobile phone.
But three years later, it's clear those tensions have been smoothed over.
Earlier this week Mr Obama described Ms Merkel as his "closest international partner" during his eight-year tenure.
And at a meeting in Berlin, he continued his praise.
"If you want to see how to build a peaceful and prosperous and dynamic society, then look at Berlin, look at Germany, look at Chancellor Merkel; her personal story helps to tell the story of incredible achievement that the German people have embarked on."
Chancellor Merkel also stressed the importance of the trans-Atlantic friendship.
"From a German point of view, German and American and European American relations are a pillar of our foreign policy, and foreign policy that is obviously guided by interests but that is very much also committed to shared values."
The leaders emphasised the importance of continuing discussions on the Transatlantic Trade and Investment Partnership which, if it goes ahead, will be the world's biggest free trade agreement.
But as the US enters a new political era, there's uncertainty over where the Trump administration will take the negotiations.
The president-elect has been a vocal opponent of the deal but despite this, Ms Merkel says Germany will make an effort to work with Mr Trump.
"Obviously I will do everything to work well with the new president, but today I would like to say thank you, thank you for a good, friendly and intensive cooperation."
Donald Trump's warmth towards Russia has caused concern among Western leaders.
Mr Obama clearly shares those concerns, and issued a thinly-veiled warning about the relationship.
"My hope is that the president-elect coming in takes a similarly constructive approach, finding areas where we can cooperate with Russia where our values and interests align but that the president-elect is also willing to stand up to Russia where they are deviating from our values and international norms."
He also warned against a cyber arms race, accusing Russia of engaging in cyber attacks during the US election campaign.
"Although we recognise Russia's intelligence-gathering will take place even if we don't like it, there's a difference between that and them either meddling with elections or going after private organisations or commercial entities."
President Obama is also scheduled to hold talks with the leaders of the United Kingdom, France, Italy and Spain, before flying to Peru for the APEC summit.
And although the visit is his last to the country as president, he promised the German people he will be back.
"I have, somehow continued missed Oktoberfest, that's probably something that's better for me to do as a former president, rather than as president. I'll have more fun."
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