KIEV, Ukraine -- Russia called for the adoption of a national unity deal in Ukraine even as it tightened its stranglehold over Crimea, an audacious combination of diplomacy and escalating military pressure. The U.S. and European Union floundered for solutions - while global markets panicked over the prospect of violent upheaval in the heart of Europe.
Fears grew that the Kremlin might carry out more land grabs in pro-Russian eastern Ukraine, adding urgency to Western efforts to defuse the crisis. U.S. Secretary of State John Kerry was heading to Kiev in an expression of support for Ukraine's sovereignty, and the EU threatened a raft of punitive measures as it called an emergency summit on Ukraine for Thursday.
But it was Russia that appeared to be driving the agenda.
Foreign Minister Sergey Lavrov said in Geneva at the beginning of a U.N. Human Rights Council session that Ukraine should return to the Feb. 21 agreement signed by pro-Russian President Viktor Yanukovych - but not Moscow - aimed at ending Ukraine's crisis. Yanukovych fled the country after sealing the pact with the opposition and foreign ministers of France, German and Poland to hold early elections and surrender many powers. "Instead of a promised national unity government," Lavrov said, "a 'government of the victors' has been created."
Then came dramatic claims from Ukraine that Russian troops had issued an ultimatum for two Ukrainian warships to surrender or be seized - prompting Ukraine's acting president to accuse Russia of "piracy."
Four Russian navy ships in Sevastopol's harbor were blocking Ukraine's corvette Ternopil and the command ship Slavutych, Ukrainian authorities said. Acting president Oleksandr Turchynov said commanders and crew were "ready to defend their ships ... They are defending Ukraine."
Vladimir Anikin, a Russian defense ministry spokesman in Moscow, dismissed the report of a Russian ultimatum as nonsense but refused to elaborate.
It was not clear what the West could do to make Russia back down. The clearest weapon at the disposal of the EU and U.S. appeared to be economic sanctions that would freeze Russian assets and pull the plug on multi-billion dollar deals with Russia. Late Monday, the EU threatened to freeze visa liberalization and economic cooperation talks and boycott the G8 summit in Russia if Moscow does not climb down on Crimean peninsula by the Thursday summit.
Already the economic fallout for Russia over its Crimea takeover was being intensely felt: Russia's stock market dropped about 10 percent on Monday and its currency fell to its lowest point ever against the dollar. But the economic consequences of antagonizing Russia were also acute for Western Europe: The EU relies heavily on Russian natural gas flowing through a network of Ukrainian and other pipelines.
By Monday it was clear that Russia had effectively turned Crimea into a protectorate.
Russian soldiers controlled all Ukrainian border posts Monday, as well as all military facilities. Troops also controlled a ferry terminal in the Ukrainian city of Kerch, just 20 kilometers (12 miles) across the water from Russia. That intensified fears in Kiev that Moscow will send even more troops into the peninsula via that route.
Border guard spokesman Sergei Astakhov said the Russians were demanding that Ukrainian soldiers and guards transfer their allegiance to Crimea's new pro-Russian local government.
"The Russians are behaving very aggressively," he said. "They came in by breaking down doors, knocking out windows, cutting off every communication."
He said four Russian military ships, 13 helicopters and 8 transport planes had arrived in Crimea in violation of agreements that permit Russian to keep its Black Sea fleet at the naval base in Sevastopol. The agreement limits the deployment of additional forces at the base.
Ukraine's prime minister admitted his country had "no military options on the table" to reverse Russia's military move into its Crimea region. Pro-Russian soldiers surrounded Ukrainian military facilities on the peninsula, completing a military takeover without firing a single shot.
Prime Minister Arseniy Yatsenyuk appealed for outside help and said Crimea remained part of his country, as European foreign ministers held an emergency meeting on a joint response to Russia's military push into Crimea.
"Any attempt of Russia to grab Crimea will have no success at all. Give us some time," he said at a news conference with British Foreign Secretary Wiliam Hague.
But he added that "for today" there were "no military options on the table," he said. He said his country was "urgently" asking for economic and political support from other countries.
The fears in the Ukrainian capital and beyond are that that Russia might seek to expand its control by seizing other parts of Ukraine in the pro-Russian east of the country, the country's industrial powerhouse and agricultural breadbasket.
Hague said "the world cannot just allow this to happen." But he, like other Western diplomats, ruled out any military action. "The U.K is not discussing military options. Our concentration is on diplomatic and economic pressure."
Faced with fears of more Russian aggression, Ukraine's new government has moved to consolidate its authority, naming new regional governors in the pro-Russia east picked among the country's wealthy businessmen.
By putting influential oligarchs in control of key eastern provinces, Kiev appears to be hoping that Russian-leaning citizens will be more willing to remain within the Ukrainian fold.
In Geneva, Lavrov attempted to deflect international blame back onto the West.
"Those who are trying to interpret the situation as a sort of aggression and threatening us with sanctions and boycotts, these are the same partners who have been consistently and vigorously encouraging the political powers close to them to declare ultimatums and renounce dialogue," Lavrov said.
"We call upon them to show a responsibility and to set aside geopolitical calculations and put the interests of the Ukrainian people above all."
Lavrov on Monday justified the use of Russian troops in Ukraine as a necessary protection for his country's citizens living there. "This is a question of defending our citizens and compatriots, ensuring human rights, especially the right to life," Lavrov said.
Market reaction to the Russian seizure of Crimea was furious Monday. In European trading, gold and oil rose while the euro and stock markets fell. The greatest impact was felt in Moscow, where the main RTS index was down 12 percent at 1,115 and the dollar spiked to an all-time high of 37 rubles.
Russia's central bank hiked its main interest rate 1.5 percentage points Monday to 7 percent, trying to stem financial outflows.
Gazprom, the Russian energy giant, was also big loser, its share price down 13 percent as investors worried about how it would get its gas to Europe if hostilities kept up, since much of it goes through Ukrainian pipelines.
Tension between Ukraine and Moscow rose sharply after Ukraine's pro-Russian President Viktor Yanukovych was pushed out by a protest movement among people who wanted closer ties with the European Union. Yanukovych fled to Russia after more than 80 demonstrators were killed near Kiev's central square. He says he is still president.
Putin's confidence in his Ukraine strategy is underpinned by the knowledge that the nation's 46 million people have divided loyalties. While much of western Ukraine wants closer ties with the 28-nation European Union, its eastern and southern regions look to Russia for support.
Crimea is where Russia feels most at home in Ukraine: It is home to 2 million mostly Russian-speaking people and landlord for Russia's critical Black Sea Fleet at Sevastopol.
Bennet reported from Kerch, Ukraine. Danica Kirka in London contributed to this report.