Afghanistan: U.S. officials confirm influx of Russian troops into Crimea --- U.S. officials said Friday that Russian troops had entered Crimea, as President Obama warned that there “will be costs for any military intervention” and vowed to stand by the Ukrainian people. -- Obama said he was “deeply concerned by reports of military movements,” that “would represent a profound interference in matters that must be determined by the Ukrainian people” and would constitute a “clear violation” of international law. -- As the United Nations Security Council held an emergency closed-door meeting, the United States and its allies scrambled to avoid a confrontation with echoes of the Cold War. -- After a day of increasingly alarming reports of an influx of Russian troops into Crimea, and U.S. references to a “fluid” situation, Obama appeared in the White House press room to pledge that “the United States will stand with the international community in affirming that there will be costs for any military intervention in Ukraine. -- “Just days after the world came to Russia for the Olympic games,” he said, “it would invite the condemnation of nations around the world.” Obama said that Vice President Biden has spoken Friday afternoon with Ukraine's new deputy prime minister “to assure him that in this difficult moment, the United States supports his government’s efforts.” -- “Any violation of Ukraine’s sovereignty and territorial integrity would be deeply destabilizing, which is not in the interests of Ukraine, Russia or Europe,” Obama said.