Obama on Ukraine: 'An Attack on One Is an Attack on All'

The president pledges assistance from US forces if a Russian-led attack were to befall Estonia.
1:40 | 09/03/14

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Transcript for Obama on Ukraine: 'An Attack on One Is an Attack on All'
His foreign policy is under fire but to -- President Obama got a standing ovation in Estonia. -- -- -- -- a NATO ally and Russia's western doorstep to 600 miles from Moscow now alarmed by Vladimir Putin's invasion of Ukraine. Wondering if Estonia could be next an attack on one. Is an attack on all. So if in such a moment you ever ask again who'll come to help you'll know the answer. The NATO alliance including the armed forces of the United States of America right here present now. US fighter jets are patrolling the Baltic skies as American tanks and personnel carriers. Prepare to deploy next month for exercises on the ground the show of strength comes ahead of the summit of NATO allies tomorrow in Wales were 67 heads of state government will grapple with how to contain Russia's advance -- Ukraine. One leader not invited Russian president Vladimir Putin. He's been discussing the cease fire with his Ukrainian counterpart today announced steps to reach a deal but there still isn't one. We have consistently supported. The effort. Present -- check over to achieve a meaningful cease fire that could lead to a political settlement. The conflict. So far it hasn't held. Until one does the White House says it will remain skeptical with tougher sanctions against Russia still on the table. Devin Dwyer ABC news traveling with the president and talent Estonia.

This transcript has been automatically generated and may not be 100% accurate.

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