Russia's War Against Ukraine
OP-ED
David Ignatius: The risk of tougher sanctions on Russia
Russian President Vladimir Putin (R) attends a sports festival for families with many children at the Adler Arena in the Russian Black Sea resort of Sochi, on June 2, 2014. Putin does not plan to meet Ukraine's president elect Petro Poroshenko when he attends D-Day anniversary events in France on June 6, his spokesman told AFP. AFP PHOTO/ RIA-NOVOSTI/ POOL /ALEXEI NIKOLSKY
Energy politics underlie the explosive Ukraine crisis, as Europeans weigh U.S. calls for tougher sanctions against the ability of Russia to disrupt gas supplies this winter.