A Ukrainian border guard sits in a military vehicle in the southern coastal town of Mariupol September yesterday after  Ukraine and pro-Russian rebels agreed a ceasefire. Photograph: Reuters

Russia’s foreign ministry has vowed to react if the European Union implements new sanctions against Moscow over its role in the Ukraine crisis. The EU(...)

Civilian volunteers help Ukrainian soldiers dig trenches around   Mariupol yesterday. The city is under threat from Russian-backed rebels. Photograph: Mauricio Lima/the New York Times

Russian leader Vladimir Putin has ramped up public support for Ukraine’s rebels, calling for urgent talks on “statehood” for regions where they are fi(...)

Russian foreign minister Sergey Lavrov (left) and Ukrainian foreign minister Pavlo Klimkin pass by one another while arriving for a group photo with French foreign minister Laurent Fabius and German foreign minister Frank-Walter Steinmeier  during talks over the ongoing conflict in eastern Ukraine at Villa Borsig in Berlin yesterday. Photograph: Sean Gallup/Getty Images

Ukrainian forces have raised their national flag over a police station in the city of Luhansk which was for months under rebel control, Kiev said yest(...)

A local woman watches armed pro-Russia militia  march towards a polling station during the referendum in the eastern Ukrainian city of Slaviansk. Photograph: Reuters/Yannis Behrakis

Ukraine has condemned a rebel referendum in eastern regions that its pro-Russian organisers claim gives them the right to split from the country.Accor(...)

A masked pro-Russia protester stands guard at a barricade outside a regional government building in Donetsk, eastern Ukraine. Photograph: Baz Ratner/Reuters

The Ukrainian government said it will not attack pro-Russian separatists over the Easter weekend as its US ally threatened Moscow with new san(...)

A pro-Russian armed man looks on near the mayor’s office in Slaviansk. Eastern Ukraine seems to be rapidly spinning out of the control of the central government. Photograph: Gleb Garanich/Reuters

Moscow must show it is serious about a de-escalation in Ukraine by pledging concrete steps to ease tensions in four-way talks scheduled for Thu(...)

Russian president Vladimir Putin has said Russia could cut natural gas supplies to Ukraine if it fails to pay its gas bills on time and warned there could be a reduction in onward deliveries to Europe. Photograph: Mikhail Klimentyev/Reuters

Russian president Vladimir Putin has warned European leaders Russia would cut natural gas supplies to Ukraine if it did not pay its bills and s(...)

The most startling part of Washington’s sanctions on Russian businessmen loyal to president Vladimir Putin may be a single sentence that conta(...)

 Protesters build  a barricade in a street in front of the state administration headquarters in Lviv, Ukraine, this evening. Photograph: Darek Delmanowicz/EPA

Enraged protesters stormed government offices in three western Ukraine cities today, forcing one governor to write a letter of resignation, as demonst(...)

Russian prime minister Dmitry Medvedev (left)  with his Ukrainian counterpart, Mykola Azarov, during a meeting in the town of Kaluga, some 150km (93 miles) southwest of Moscow, earlier this month. Photograph: Alexander Astafyev/RIA Novosti/Pool/Reuters

Russia says it will take measures against Ukraine unless it urgently settles a €640 million energy bill, fuelling fears that the neighbours may engage(...)