President Obama spoke about Ukraine moments ago in D.C., mentioning the United States’ pledged $1 billion in aid to Ukraine.

'Nothing Strong About What Russia Is Doing': Kerry Speaks on Ukraine Crisis

“Over the past several weeks, we've been working with our partners and with the IMF to build international support for a package that helps to stabilize Ukraine's economy,” President Obama said.

The package includes technical assistance to repair Ukraine’s economy and assistance for the country’s upcoming election.

President Obama charged that Russia’s Vladimir Putin is violating international law.

“President Putin seems to have a different set of lawyers making a different set of interpretations. But I don’t think that’s fooling anybody.”

Today at 3p ET on Fox News Channel, Shepard Smith reports live from Kiev, Ukraine with the latest on the crisis.

Meanwhile, video reportedly shows Ukrainian troops marching on an air base in the Crimea region when Russian forces fired shots, warning them not to get any closer.

Russian President Vladimir Putin spoke publicly, saying there has been an unconstitutional coup in Ukraine. He vowed to use force only as a last resort. Watch his remarks below:

Powerful analysis of the Ukraine Crisis on Fox News:

McCain: China Will Follow Putin With 'More Aggressive' Actions

Palin on 'Hannity': ‘Putin Doesn’t Change His Stripes’

Bill O’Reilly on Putin: ‘Long Past Time to Deal With This Thug’

Krauthammer: Obama 'Is Living in a Fantasy World'

Rumsfeld: ‘It Is U.S. Weakness That Has Shaken the World’