Darko Vojinovic, Associated Press
PEREVALNE, Ukraine — As hundreds of armed men surrounded a Ukrainian military base in Crimea on Sunday, world leaders and Ukraine's new prime minister urged Russian President Vladimir Putin to pull back his military.
U.S. Secretary of State John Kerry called Russia's military incursion into Ukraine "an incredible act of aggression" — comments that came a day after Russian forces took over the strategic Black Sea peninsula of Crimea from Ukraine without firing a shot.
In Kiev, the Ukrainian capital, Prime Minister Arseniy Yatsenyuk said there was no reason for Russia to invade Ukraine and warned that "we are on the brink of disaster."
But so far, his new government and other countries have been powerless to react to Russian military tactics. Armed men in uniforms without insignia have moved freely about the peninsula, occupying airports, smashing equipment at an air base and besieging a Ukrainian infantry base.
Putin has defied calls from the West to pull back his troops, insisting that Russia has a right to protect its interests and those of Russian-speakers in Crimea and elsewhere in Ukraine.
Russia has long wanted to reclaim the lush Crimean Peninsula, which was part of Russia until 1954. It's Black Sea Fleet is stationed there and nearly 60 percent of Crimea's residents identify themselves as Russian.
Ukraine's population of 46 million has divided loyalties between Russia and Europe, with much of western Ukraine advocating closer ties with the EU, while eastern and southern regions like Crimea look to Russia for support.
Unidentified troops pulled up to the Ukrainian military base at Perevalne on the Crimean Peninsula in a convoy that included at least 13 trucks and four armored vehicles with mounted machine guns. The trucks carried 30 soldiers each and had Russian license plates.
A dozen Ukrainian soldiers, some with clips in their rifles, placed a tank at the base's gate, leaving the two sides in a tense standoff.
Ukraine's acting president, Oleksandr Turchynov, announced late Saturday that he had ordered Ukraine's armed forces to be at full readiness because of the threat of "potential aggression." He also said he had ordered stepped-up security at nuclear power plants, airports and other strategic infrastructure.
But the U.S. and other Western governments have few options to counter Russia's military moves.
In Brussels, NATO's secretary general said Russia had violated the U.N. charter with its military action in Ukraine, and he urged Moscow to "de-escalate the tensions." NATO chief Anders Fogh Rasmussen spoke before a meeting Sunday of the alliance's political decision-making body to discuss the crisis.
Ukraine is not a NATO member, meaning the U.S. and Europe are not obligated to come to its defense. But Ukraine has taken part in some alliance military exercises and contributed troops to its response force.
Kerry, interviewed on Sunday news shows in the U.S., raised the possibility of boycotting the G-8 summit, which is to be held in June in Sochi, the Russia resort that just hosted the Winter Olympics. He also discussed visa bans, asset freezes, and trade and investment penalties. Kerry said he spoke with foreign ministers for G-8 and other nations on Saturday, and says everyone is prepared 'to go to the hilt" to isolate Russia.
President Barack Obama spoke with Putin by telephone for 90 minutes Saturday and expressed his "deep concern" about "Russia's clear violation of Ukrainian sovereignty and territorial integrity," the White House said. Obama warned that Russia's "continued violation of international law will lead to greater political and economic isolation."
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