Joe Biden meets Russia's Vladimir Putin on Wednesday, fresh from days of talks with European leaders on his first visit to the continent as US president.

Mr Biden has met leaders at the G7 in Cornwall, then at Nato and EU headquarters in Brussels. So what impression has he made? Here, three prominent Europeans give their assessments:

Europe back at heart of US global policy

By David O'Sullivan, EU ambassador to the US (2014-19)

What lessons have Europeans learned from Biden's trip?

President Biden has reaffirmed America's traditional support for the European Union as an important partner in global affairs.

Tuesday's EU-US summit declaration announces a series of joint actions, ranging from the response to the pandemic and action in the fight against climate change to strengthened co-operation on trade, investment, and technology. There's also a firm commitment to defend democracy and human rights.

There is even a breakthrough agreement on greater joint work and co-operation in the area of security and defence, previously an almost taboo subject.

A series of working groups and a new Trade and Technology Council will ensure that, in the coming months, the co-ordination is intensified across the full range of these issues. Europe, and specifically the EU, is back at the centre of US global policy.

Has Biden's visit improved security in Europe?

President Biden's very strong reassertion of America's support for Nato and, in particular, Article 5, represents an important return to the American leadership of the past and a big reassurance for European security. [Article 5 commits members to defend each other from attack].

How does this trip compare with those of Biden's predecessors?

The entire choreography of his visit to Europe was designed to show his strong commitment to the transatlantic relationship, the value he places on allies and alliances, such as Nato, the G7 and the EU, and a heartfelt commitment to multilateralism.

The contrast with the Trump years could hardly be more marked but, arguably, demonstrates a stronger engagement with Europe than even that of President Barack Obama. The breakthrough on the long-running Airbus-Boeing dispute shows that this is not just about rhetoric but also about delivery.