Such action by Russia would not serve the interests of the Ukrainian people, Russia or Europe, Obama said, and would represent a “profound interference” in matters he said must be decided by the Ukrainian people.
“Just days after the world came to Russia for the Olympic Games, that would invite the condemnation of nations around the world,” Obama said. “The United States will stand with the international community in affirming that there will be costs for any military intervention in Ukraine.”
He did not say what those costs might be.
U.S. officials said Obama may scrap plans to attend an international summit in Russia this summer and could also halt discussions on deepening trade ties with Moscow. Russia is scheduled to host the Group of Eight economic summit in June in Sochi, the site of the recently completed Winter Olympics.
Earlier, at the United Nations, the Ukrainian ambassador, Yuriy Sergeyev, said 10 Russian transport aircraft and 11 attack helicopters had arrived in Crimea illegally, and that Russian troops had taken control of two airports in Crimea.
He described the gunmen posted outside the two airports as Russian armed forces and “unspecified” units.
“Some of them identified themselves as Russians. We know specifically some of the units,” Sergeyev said. He also said the Russians had captured the main air traffic control center on Crimea.
Serhiy Astakhov, a spokesman for the Ukrainian border service, said eight Russian transport planes landed on the Crimea peninsula in southern Ukraine with unknown cargo.
He said the Il-76 planes arrived unexpectedly and were given permission to land, one after the other, at Gvardeiskoye air base, north of the regional capital, Simferopol. Astakhov said the people in the planes refused to identify themselves and waved off customs officials, saying they didn’t require their services.
Russia kept silent on claims of military intervention, even as it maintained its hard-line stance on protecting ethnic Russians in Crimea, a territory that was once the crown jewel in Russian and then Soviet empires and has played a symbolic role in Russia’s national identity.
Ukraine’s fugitive president, meanwhile, resurfaced in Russia to deliver a defiant condemnation of what he called a “bandit coup.”
Appearing for the first time since fleeing Ukraine last week, Viktor Yanukovych struck a tone both of bluster and caution — vowing to “keep fighting for the future of Ukraine.” But he said he would not ask for Russian military help.
“Any military action in this situation is unacceptable,” Yanukovych told reporters in the southern city of Rostov-on-Don, near the border with Ukraine.
Earlier Friday, reporters in Crimea spotted a convoy of nine Russian armored personnel carriers on a road between the port city of Sevastopol, where Russia has a naval base, and the regional capital, Simferopol. Later in the day, the airspace was closed over the peninsula, apparently due to tensions at the two airports.
Russian armored vehicles bearing the nation’s tricolor rumbled across Crimea and men described as Russian troops took position at airports and a coast guard base.
Oleksandr Turchynov, who stepped in as president after Yanukovych fled Kiev last weekend, urged Russian President Vladimir Putin to stop “provocations” in Crimea and pull back military forces from the peninsula. Turchynov said the Ukrainian military would fulfill its duty but would not be drawn into provocations.
In recent conversations between U.S. and Russian officials, including a lengthy telephone conversation between Obama and Putin last week, Obama said the U.S. has made clear that Russia can be part of the international community’s effort to support the stability and success of Ukraine.
But, he said Friday, “we are now deeply concerned by reports of military movements taken by the Russian Federation inside of Ukraine.”
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The airport deployments came a day after masked gunmen with rocket-propelled grenades and sniper rifles seized the parliament and government offices in Simferopol and raised the Russian flag. Ukrainian police cordoned off the area but didn’t confront the gunmen. They remained in control of the buildings Friday.
Ukraine’s population is divided in loyalties between Russia and the West, with much of western Ukraine advocating closer ties with the European Union, while eastern and southern regions look to Russia for support.
Crimea, a southeastern peninsula of Ukraine that has semi-autonomous status, was seized by Russian forces in the 18th century under Catherine the Great. It became part of Ukraine in 1954 when Soviet leader Nikita Khrushchev transferred jurisdiction from Russia, a move that was a mere formality until the 1991 Soviet collapse meant Crimea landed in an independent Ukraine.
That complicated history hangs over Ukraine’s crisis.
“Crimea,” said Steven Pifer, a former U.S. ambassador to Ukraine who is now an analyst at the Brookings Institution, “is the flashpoint everybody needs to be watching.”