Stay tuned to Fox News and check back here throughout the day for all of the latest developments on the Ukraine crisis:

UPDATE, 3:00p ET: Fox News has confirmed Russia launched a missile test. FoxNews.com reported: "The Strategic Rocket Forces launched an RS-12M Topol missile from a region near the Caspian Sea, successfully hitting its target in Kazakhstan."


UPDATE, 12:15p ET: President Obama has now made some brief remarks on the Ukraine crisis, declaring that Putin is "not fooling anybody" with his assertions that the invasion of Crimea is not a violation of international law.


UPDATE, 11:55a ET: Secretary of State John Kerry just spoke from Kiev, reaffirming support for the new government in Ukraine and declaring that there is "nothing strong" about what Russia has done in response.


Amy Kellogg led off America's Newsroom this morning with a report from Kiev as Russian President Vladimir Putin refuses to back down. She says concerns remain that there will be a misstep by one of the side's forces in Crimea that could lead to violence. Kellogg noted that this morning, angry Ukrainian soldiers demanded their jobs back at an air base in Sevastopol, leading Russian forces to fire warning shots.

Watch Amy's report below. You can see brand new video of the standoff above.


Powerful analysis of the Ukraine Crisis on Fox News:

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Krauthammer: Obama 'Is Living in a Fantasy World'

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


Russian President Vladimir Putin spoke out Tuesday, saying an unconstitutional coup has taken place in Ukraine and maintaining that Russia reserves the right to use any means to protect Russians in Crimea. He warned the West against imposing sanctions on the Kremlin, adding that Russia still considers Viktor Yanukovych to be the legitimate president of Ukraine.

Meantime, Secretary of State John Kerry has arrived in Kiev to show support for the country's new leaders. Putin argues the country's interim president Oleksandr Turchynov is not legitimate.

On Fox and Friends this morning, Rudy Giuliani weighed in on the tense situation. Watch the discussion below:

Read more at FoxNews.com:

Russian President Vladimir Putin Tuesday blamed what he called an "unconstitutional overthrow and seizure of power" by Ukraine's opposition for the ongoing crisis in Crimea and rejected Western threats to punish Russia with sanctions by claiming that they will backfire if imposed. 

Putin spoke at a news conference at his residence outside Moscow as U.S. Secretary of State John Kerry was en route to Ukraine to show his support for that country's interim government. That leadership has accused Moscow of a military invasion in Crimea. The Kremlin, which does not recognize the new Ukrainian leadership, insists it made the move in order to protect Russian installations and its citizens living there. 

Putin's remarks were his first public comments on the situation in Ukraine since its former President, Viktor Yanukovych, fled the capital, Kiev, February 22. The Russian leader accused the West of using Yanukovych's decision in November to ditch a pact with the 28-nation European Union in favor of closer ties with Russia to encourage the months of protests that drove him from power.

"Of course people wanted change," Putin said of the protests in Kiev's Independence Square. "But [people] cannot impose illegal change ...you need to use only constitutional means."