Obama going to stop Putin with ... a tweet?

(Fox News) -- The Obama administration using Twitter to show public support for Ukraine and to negotiate with Russia after the annexation of Crimea is sparking another round of accusations about President Obama being soft on foreign policy.

The most recent criticism followed a tweet late Thursday by State Department spokeswoman Jen Psaki.

“The world stands #UnitedforUkraine. Let’s hope that the #Kremlin & @mfa Russia will live by the promise of hashtag,” she posted.

The tweet apparently was in response to Russia using the hashtag -- which essentially brings like-minded tweets into a collective batch -- to further its own agenda on social media.

“Note to the State Department: ‘The promise of a hashtag’ isn't going to make [Russian President] Putin pull out of Ukraine,” Texas GOP Sen. Ted Cruz tweeted Saturday.

Supporters of the administration using Twitter argue that social media is a fast, non-filtered way to connect with Ukrainians and others around the world, particularly amid the country's months of political unrest.

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