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Russia's President Vladimir descends from his plane while arriving in the Volga River city of Samara 868 km (539 miles) southeast of Moscow, on July 21, 2014. US President Barack Obama said yesterday that Putin must prove "that he supports a full and fair investigation" of the Malaysian plane disaster. AFP PHOTO / RIA-NOVOSTI / POOL/ ALEXEI NIKOLSKYALEXEI NIKOLSKY/AFP/Getty Images
Russia's President Vladimir descends from his plane while arriving in the Volga River city of Samara 868 km (539 miles) southeast of Moscow, on July 21, 2014. US President Barack Obama said yesterday that Putin must prove "that he supports a full and fair investigation" of the Malaysian plane disaster. AFP PHOTO / RIA-NOVOSTI / POOL/ ALEXEI NIKOLSKYALEXEI NIKOLSKY/AFP/Getty Images

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    Will new sanctions against Russia work?

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Will new sanctions against Russia work?

CNN's Jake Tapper asks the State Dept.'s Marie Harf why the administration thinks this new round of sanctions will work.

Will new sanctions against Russia work?

CNN's Jake Tapper asks the State Dept.'s Marie Harf why the administration thinks this new round of sanctions will work.