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U.S. Secretary of State John Kerry is reinforcing U.S. support for Ukraine's sovereignty Tuesday, as he visits Kyiv amid a growing crisis over Russia's military presence in the Ukrainian region of Crimea.

State Department spokeswoman Jen Psaki says Kerry is meeting members of the interim government to discuss Ukraine's economic and political needs and see "what additional support" the United States can provide.

The U.S. and its European allies are considering sanctions against Russia for its troops movements into Ukraine.

U.S. President Barack Obama met with Kerry, Defense Secretary Chuck Hagel and other members of his national security team Monday night at the White House to discuss policy options.

Earlier Monday, President Obama called on Congress to approve an aid package for the new Ukrainian government.