European leaders, backed by President Barack Obama, have come to an uncomfortable conclusion: they need Russia.
Truth no closer for families of the 298 people killed as pro-Russia separatists, Moscow and Ukrainian forces all deny involvement.
Tens of thousands of people marched in central Moscow on Sunday to honour slain opposition leader Boris Nemtsov, who was gunned down near the Kremlin.
Ignoring a ceasefire, pro-Russian rebels have forced Kiev's soldiers to flee the strategic Debaltseve rail hub in eastern Ukraine.
Many Ukrainian men are lying low to avoid being drafted to fight pro-Russia 'terrorists' in the east of the country.
The leaders of France, Germany, Russia and Ukraine hope to strike a peace deal and end 10 months of fighting in which at least 5 300 people have died.
A day after a US ratings agency downgraded ?Russia to "junk" status, the country's index fell by 3%. Russia could also face new sanctions.
Ukraine tells Davos it has a plan and Russia says it wants the war to end but civilians are still dying.
Ukraine and pro-Russian rebels are set to complete a swap of hundreds of prisoners as part of a new push for peace.
Negotiations broke up after more than five hours on Wednesday with the pro-Russian rebels reporting little to no progress.
M&G's photo editor Paul Botes brings you a selection of captivating photos from around the world, including some of the events that made headlines this year.
A partial vote count from Ukraine's elections shows pro-Western parties are taking the lead, with pro-Russian parties falling far behind in support.
Nato leaders have agreed to boost the military alliance's readiness to meet fresh security threats by setting up a new rapid reaction force.
A preliminary protocol to the ceasefire agreement has been signed between Ukraine and pro-Russian rebels.
Russian Foreign Minister Sergei Lavrov has warned Nato and the US not to offer Ukraine membership of the alliance, ahead of a Nato summit.
Ukraine's president has announced a ceasefire agreement with Russia, shortly before Nato's deadline for a decision on involvement in the region.
The Ukraine crisis is the most serious threat to Euro-Atlantic security since the Cold War, according to Nato head Anders Fogh Rasmussen.
China says the EU's proposed additional sanctions on its key ally Russia will not solve the current problems in Ukraine.
Pro-Russian separatists are preparing a fresh offensive in Ukraine as EU leaders give Moscow one week to curb support for rebels or face sanctions.