The world’s best animal architecture - in pictures

Australian weaver ants building their nest by pulling on leaves and working in chains, in Northern Territory, Australia. The adult builders pull leaves together with their pincers then interweave them with silk threads produced by their larvae. They can build an entire nest in 24 hours. Photograph: Ingo Arndt

The artist who lays eggs with her vagina – or why performance art is so silly

Performance artist Milo Moiré creates abstract paintings by pushing eggs filled with paint and ink out of her vaginal canal. She does this while standing naked in front of an audience. The nudity, apparently, is artistically essential. As for the act of pushing paint-filled eggs out of her body, it is – as no doubt you perceive – a powerful feminist statement about women, fertility and creativity. 

Jonathan Jones.

Ukraine’s acting president calls for action against pro-Russian separatists

Ukraine’s acting president has called for the resumption of military operations against pro-Russian separatists in the east of the country, claiming two of his party’s supporters had been “tortured to death”, in a further blow to an unravelling international peace plan.

Oleksandr Turchynov said “counter-terrorist” operations in the region, suspended as part of the peace agreement in Geneva last Thursday, should restart after the bodies of two men, one a pro-Kiev politician, had been found near the rebel-held town of Slavyansk. Full story

Photograph: Itar-Tas/Barcroft Media

Tony Blair to say battle against Islamic extremism is paramount

The former prime minister will warn the west it needs to take sides in the Middle East and move the battle against Islamist extremism to the top of the political agenda.

In a speech to Bloomberg in London on Wednesday, he will say:

The important point for western opinion is that this is a struggle with two sides. So when we look at the Middle East and beyond it to Pakistan or Iran and elsewhere, it isn’t just a vast unfathomable mess with no end in sight and no one worthy of our support. It is in fact a struggle in which our own strategic interests are intimately involved; where there are indeed people we should support and who, ironically, are probably in the majority if only that majority were mobilised, organised and helped.

Full story | Live reaction to Tony Blair’s speech

Photograph: Matt Rourke/AP

South Korean ferry sinking: 104 dead, 198 still missing

The death toll in the South Korean ferry disaster rose to more than 100 on Tuesday as the country’s president launched a scathing attack on the ship’s crew, while the parents of hundreds of missing children conceded that the rescue operation had become a quest to simply recover and identify the dead as quickly as possible. Full story 

Photograph: Yonhap/EPA

2014 Boston Marathon – in pictures

A runner with a temporary Boston Marathon tattoo gets ready to run. Photograph: Andrew Burton/Getty Images

“The crisis in Yarmouk is unfolding as new UN documents appear to support a widespread opposition claim that the regime of President Assad is using starvation tactics as a weapon of war.”

Ukraine crisis: Geneva deal hangs by a thread as five people die in Slavyansk

The tentative Geneva deal to resolve the Ukraine crisis is hanging by a thread after as many as five people were killed in a gun battle near the volatile eastern town of Slavyansk early on Sunday.

An Easter truce declared by the authorities in Kiev was rudely shattered after two groups opened fire on each other overnight. Full story

Photograph: Kirill Kudryavtsev/AFP/Getty Images

How to transform a Victorian warehouse for just £800 - in pictures

Bobby Petersen has turned an industrial loft from an abandoned graffitied shell into an airy live/work space using clever ideas and a tiny budget. Here’s how