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<meta name="twitter:site" value="@nytimes">
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<meta name="twitter:url" content="http://www.nytimes.com/2013/07/19/world/europe/moscow-trip-for-obama-may-be-off-as-snowden-tensions-build.html?pagewanted=all"/>
<meta name="twitter:title" content="Obama May Cancel Moscow Trip as Tensions Build Over Leaker"/>
<meta name="twitter:description" content="If President Obama cancels the meeting in Moscow, it would be seen as a direct slap at President Vladimi