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

Ukraine crisis: Geneva talks produce agreement on defusing conflict

The US, Russia, Ukraine and the European Union have reached an agreement aimed at pulling eastern Ukraine back from the brink of war.

The deal calls for the disarming of all illegal groups, who will have to vacate all occupied government buildings and public spaces. Full story

Pictured: Seven hours of negotiations in Geneva ended in agreement on a series of ‘concrete steps’. Photograph: Eric Bridiers/EPA

Migrants face ‘living hell’ in Greek detention

Migrants and asylum-seekers detained in Greece are being forced to endure deplorable conditions, often with devastating effects on their health, according to a report from aid agency Médecins Sans Frontières (MSF).

Doctors who have attended internment camps, police stations and coastguard facilities around the country described “a living hell” for thousands of immigrants denied fresh air, natural light and basic sanitation.

In one detention camp in Komotini, not far from the Turkish border, doctors saw human excrement seeping through cracked pipes between the building’s floors. Full report

Photograph: ZUMA/REX

London is the billionaire’s preferred European residence, study says

The typical billionaire holds £50m or more in real estate and has four homes. A property portfolio would typically include a £22.3m mansion in London; an £18.6m holiday home on the French Riviera and a £12.1m estate in Tuscany, alongside another luxury pad. Read more

Pictured: Billionaire’s favour London’s ‘platinum triangle’ comprising Mayfair (above), Belgravia and Knightsbridge. Photograph: Beauchamp Estates

Barack Obama seeks European support for harder line on Russia sanctions

President Obama arrives on Monday morning in the Netherlands, where he will try to gauge how far European allies are willing to go to stop Moscow from moving deeper into Ukraine after annexing Crimea.

The US president is visiting Europe for talks with fellow leaders when he will try to persuade them to increase pressure on Russia.

It comes as Russian troops backed by helicopters stormed a Ukrainian naval base on the Crimea peninsula early on Monday, one of the few military facilities that was still flying a Ukrainian flag in Crimea after Russia’s annexation. Read more

Pictured: US president Barack Obama departs Washington for his week-long trip to the Netherlands, Belgium, Italy and Saudi Arabia. Photograph: Kevin Lamarque/Reuters

Ukraine Crisis: Crimea polls open - live updates

Voting has begun in the Crimean referendum to decide if the region leaves the Ukraine to become part of Russia. The referendum has already been dismissed as illegitimate by President Obama

The Crimea is predominantly ethnic Russian, and many of its residents say they fear that the new Ukrainian government, who took power after the ousting of pro-Russia President Viktor Yanukovych, will oppress them. Follow the live blog

Photograph: Sergei Karpukhin/Reuters

Fatal clashes as Ukraine dissolves Crimean parliament - live updates

Two people killed and five injured in clashes between pro-Ukrainian and pro-Russian activists before Sunday’s secession referendum. Follow the live blog here

Pictured: People speak in front of a placard depicting the Russian president, Vladimir Putin, as a dancing ballerina wearing a bulletproof vest with Kalashnikov machine gun. Photograph: Yuriy Dyachyshyn/AFP/Getty Images

Ukraine parliament delivers ultimatum to Crimea over referendum

Ukraine’s parliament has warned the regional assembly in Crimea that it faces dissolution unless it cancels a referendum it has called to join the region to Russia.

A resolution, supported by a parliamentary vote, gave the Crimean parliament until Wednesday to call off the referendum, due to take place on Sunday.

The Crimean parliament on Tuesday passed a motion stating that it would become independent in the event of a yes vote and then seek to join the Russian Federation, arguing that “the unilateral declaration of independence of part of a state does not violate any international laws”. Increasing their isolation from Kiev, the pro-Russian authorities have closed Crimea’s airspace to commercial flights. Read more

Photograph: Zurab Kurtsikidze/EPA

Ukraine crisis: ‘Russia in control of Crimea’ - live updates

• Russia has ‘complete operational control’ - US official
• Russian jets violate Ukrainian airspace - defence ministry
• Russian troops take over Ukraine ferry terminal
• Ukrainian officers urged to join defecting navy chief

Pictured: Armed military personnel in Simferopol, Crimea. Photograph: Thomas Peter/Reuters

Ukraine crisis: deadly clashes shatter truce – live updates

• Protesters gain upper hand in new clashes 
• Dozens killed and injured in gunfire 
• Obama accuses Russia of failing to respect freedom
• EU foreign ministers to decide on sanctions

Read the latest summary here

Photograph: Bulent Kilic/AFP/Getty Images