Russia's War Against Ukraine
OP-ED
Mike Sigov: United States, European allies must act to halt Putin’s aggression
A tank with a flag of Novorossia (union of Donetsk people's republic and Lugansk people's republic) drives in central Donetsk late on August 23, 2014.
Russian President Vladimir Putin killed the chance of peace in Ukraine when he escalated Russia's armed incursion into east Ukraine late last month.