Obama pressures putin to block prorussian separatists
Ukraine and pro-Russian rebels reach ceasefire deal
The ceasefire deal was struck in the Belarusian capital along with a deal allowing for prisoner exchanges
The Russian President said he believed Kiev and pro-Russian separatists could come to an agreement.
Ukraine called on Friday for full membership in NATO, its strongest plea yet for Western military help.
An import ban on food comes after Vladimir Putin ordered retaliation for Western sanctions against Moscow.
Coca-Cola Co confirmed it had taken advertisements off four Russian television channels.
Leaders on Monday agreed to impose sanctions on Russia's financial, defence and energy sectors.
Russia is satisfied that the Netherlands, rather than Ukraine, is leading the effort.
The remains of nearly 300 victims of the Malaysia Airlines plane were sent to the Netherlands.
Obama says the burden is now on Moscow to insist that separatists stop tampering with the crash site.