The World Tonight

The prime minister did not know Lord Mandelson failed security vetting for the role of US ambassador until earlier this week, the government has said. We hear from the BBC's political editor and a Labour backbencher.
As a ceasefire between Lebanon and Israel comes into effect, we speak to our correspondent on the border between the two countries.
Also on the programme: A rare interview with a representative of the Russian government. And as the Pope criticises "tyrants" who spend billions on war, we look at the modern history of pacifism.

The Chancellor Rachel Reeves has said that the US made a "mistake" by ending diplomatic negotiations with Iran and entering into military conflict. Speaking on the sidelines of the International Monetary Fund Spring Meetings of finance ministers and bankers, Ms Reeves said the best way to prevent Tehran from developing nuclear weapons was through diplomacy. The BBC has also spoken to the Governor of the Bank of England about how severe the impact on the British economy will be from continued disruption to energy supply.
Also on the programme, the BBC's Chief International Correspondent Lyse Doucet reports from inside Iran, amid reports of a possible second round in US-Iran negotiations.
And the rise of "angry young women" - has the 'manosphere' found its feminist equivalent?

One of the authors of the government’s Strategic Defence Review has hit out at what he calls "corrosive complacency" on the part of the government. Lord Robertson, a former Labour defence secretary and NATO secretary general, said current levels of welfare spending were unsustainable and that security must be prioritised.
Also on the programme: The International Monetary Fund warns that the war in Iran will hurt the UK more than any G7 country. And we look at a landmark exhibition on the history of Black British music.

An American blockade of the Strait of Hormuz has come into force, after the failure of peace talks with Iran at the weekend. Tehran says it'll retaliate, but President Trump has repeated his threat to destroy any Iranian attack vessels which approach the blockade. We speak to a representative of independent tanker owners and operators across the globe .
Also on the programme: The dispute between President Trump and Pope Leo deepens, with Mr Trump saying he would not apologise to the pontiff; and we hear about the life of a self-taught topiary artist who has been called the "Picasso of Plants".

Having travelled further from Earth than any of their predecessors, the four astronauts aboard the Orion capsule are preparing to splash down in the Pacific Ocean. We speak to our correspondent at mission control in Houston and hear from two young astronomers on what the expedition has meant to them.
Also on the programme: The UK government shelves its Chagos Islands deal. And in the first case of its kind, a man in Scotland has been jailed for killing his wife even though she took her own life – we hear from the case’s prosecutor.