Ukraine forces and pro-Russian rebels blame each other for attack outside eastern city of Luhansk
Putin retaliates in the latest round of the trade war, but knock-on effects will be felt in Russia too
UK defence watchdog says major overhaul is required to defend against cyber-warfare and 'irregular militias'
Sanctions that tip Russia into recession only pile the pressure on Putin to grab what he can in Ukraine
European Union due to agree new sanctions after downing of flight MH17 and fighting in Ukraine
New measures risk a return to Cold War relations while some ask: why no action over Gaza crisis?
Obama accuses Russia of breaking Cold War test treaty with cruise missile launch
Russia says US and EU sanctions are 'absolutely unacceptable' and warns of reprisals
Cameron urges EU to punish Russia for links to separatists – but sanctions will hurt Europe too
For Putin, this is the worst collision between Russia and the West since the end of the Cold War
If Malaysia Airlines flight MH17 was shot down by a missile, it won't have been the first
Experts say Malaysia Airlines flight MH17 is likely to have been downed by a Buk missile launcher. But who fired it?
Transport aircraft brought down by missile as president claims Russian military are in Ukraine
Ukraine demands the return of its military animals from Crimea, but Russia is unlikely to agree
How the World Cup in Brazil would pan out if it was decided by alcohol intake
World Cup whispers: Russia and Mexico draw, Belgium have a narrow escape
Look at photos, read analysis from both sides and see what the protesters eat – in five tweets
Stefan Wolff and Tatyana Malyarenko propose a three-point plan to deal with Russian intransigence
Typhoon fighter jets sent to investigate Russian long-range bombers approaching UK airspace
Former PM tells London audience the West should ignore 'differences' with Russia to combat extremism