US president rings changes since Trump but has a serious message on Northern Ireland peace process

Joe Biden has stressed the need for the worlds democracies to stand together as he arrived in the UK on his first overseas trip as US president.
Biden will meet Boris Johnson in Cornwall on Thursday ahead of the G7 summit and is expected to deliver a warning not to let the Brexit trade dispute imperil the Northern Ireland peace process.
The president will also seek to show the US is back as a serious international diplomatic force after the Donald Trump years, using the visit to Europe to shore up transatlantic alliances.
Biden flew in to the UK on Air Force One, landing at the US airbase at RAF Mildenhall before heading on to Cornwall for Thursdays talks with Johnson and the G7 summit in Carbis Bay.
He told an audience of US military personnel and service families at the base: We are going to make it clear that the US is back and democracies of the world are standing together to tackle the toughest challenges and the issues that matter most to our future.
He called for international action to tackle climate crisis and end the Covid-19 pandemic.
This diplomacy is essential because no single nation acting alone can meet all the challenges we face today because the world is changing, Biden said.
The US is expected to buy 500m more doses of the Pfizer Covid-19 vaccine to share through the global Covax alliance for donation to 92 lower income countries and the African Union over the next year.
Ahead of the talks with Johnson, Bidens national security adviser Jake Sullivan warned that the president had very deep concerns on the problems provoked by Brexit.
Sullivan said the president believed the post-Brexit Northern Ireland Protocol was critical to ensuring that the Good Friday Agreement is protected. Britain and the EU are trying to resolve the issue of checks on goods crossing the Irish Sea.
The adviser told the BBC that both sides must continue with negotiations, adding: Whatever way they find to proceed must, at its core, fundamentally protect the gains of the Good Friday Agreement and not imperil that.
Joe Biden and first lady Jill Biden hold up challenge coins, as they prepare to leave RAF Mildenhall for Cornwall. Photograph: Kevin Lamarque/Reuters
That is the message that President Biden will send when he is in Cornwall.
Sullivan declined to say whether a failure to alleviate the Northern Ireland concerns could jeopardise a transatlantic trade deal, but added that our concern runs very deep on the Northern Ireland issue.
After touching down at RAF Mildenhall and addressing the personnel, Biden and his wife, Jill, flew on to Cornwall.
Bidens trip to Europe also takes in a Nato meeting and talks with Russias Vladimir Putin to let him know what I want him to know.
After the summit ends, the president and first lady will meet the Queen at Windsor Castle.