The U.S. waits to hear a reaction from Moscow as new tougher sanctions go into effect. Tracie Potts reports.
President Obama and Russian President Vladimir Putin meet briefly during D-Day celebrations as tensions over Ukraine simmer.
New U.S. intelligence assessments say there are more indications than ever that Russia could invade eastern Ukraine, as congressional lawmakers reacted with alarm to Vladimir Putin's rapidly expanding military buildup along the border.
President Barack Obama says that Russia is a "regional power," rather than the top geopolitical enemy of the United States.
Russian President Putin claims Crimea is now part of Russia. Signs treaty to take over country.
Russian President Vladimir Putin signed a decree on Monday recognizing Ukraine's Crimea region as a sovereign state.
President Barack Obama said Monday that new sanctions on Russian officials will "continue to increase the costs" on its government and that the United States is prepared to impose further sanctions if needed.
A joint naval exercise of U.S., Bulgarian and Romanian naval forces in the Black Sea has started, the Bulgarian navy said on Wednesday.
President Obama answered questions about a variety of hot topics, from NSA leaker Edward Snowden, to his relationship with the president of Russia.