Russia said on Monday that a Western-backed peace deal in Ukraine is being used to make a power grab and interim authorities were employing "terrorist methods" to suppress dissenters in Russian-speaking regions.
Moscow criticized Western support for a snap presidential election in May following Viktor Yanukovich's ousting and said constitutional reforms rushed through parliament should instead be widely debated and put to a national referendum.
It said the concerns among lawmakers in Crimea and eastern and southern Ukraine must be taken into account, referring to Russian speaking regions that traditionally favor close ties with Moscow.
The ministry said the stance of "some of our Western partners" was driven "not by a concern for the fate of Ukraine but by unilateral geopolitical calculations".
Meanwhile, Ukraine's new authorities issued an arrest warrant for mass murder against ousted President Viktor Yanukovich, who is on the run after being toppled by bloody street protests in which police snipers killed opposition demonstrators.
Russia, Yanukovich's main backer, cast doubt on the legitimacy of the new Ukrainian authorities, declaring that Russian citizens' lives were under threat there, and contacted NATO to express concern.
European Union foreign policy chief Catherine Ashton arrived in Kiev to discuss measures to shore up the ailing economy, which the finance ministry said needs urgent financial assistance to avoid default.
The EU has contacted the United States, Japan, China, Canada and Turkey to coordinate aid for Ukraine, a senior European Commission official said. France's foreign minister said an international donors' conference was being discussed.
Yanukovich, 63, who fled Kiev by helicopter on Friday, was still at large after heading first to his power base in the east, where he was prevented from flying out of the country, and then diverting south to Crimea, acting interior minister Arsen Avakov said.
Yanukovich had left a private residence in Balaclava, in pro-Russian Crimea, for an unknown destination by car with one of his aides and a handful of security guards, Avakov said.
It was an ignominious political end for Yanukovich who has been publicly deserted by some of his closest erstwhile allies, stripped of his luxury residence near Kiev and had to witness the release from prison of his arch-rival Yulia Tymoshenko.
Russia recalled its ambassador from Kiev for consultations on Sunday, accusing the opposition of having torn up a transition agreement with the president it supported.
Prime Minister Dmitry Medvedev said Moscow had grave doubts about the legitimacy of those now in power in Ukraine and their recognition by some states was an "aberration".
Russia cited a duty to protect the lives of its citizens in 2008 as one justification for military intervention in Georgia, another former Soviet republic, in support of Kremlin-backed separatists in South Ossetia.
On Independence Square in central Kiev, cradle of the uprising, barricades of old furniture and car tyres remained in place, with smoke rising from camp fires among tents occupied by diehards vowing to stay until elections in May.
The mood among the few hundred on the square was a mixture of fatigue, sorrow for the more than 80 people killed last week, and a sense of victory after three months of protests.
A large video screen by the side of the stage was showing the faces of the dead, one after another, on a loop.
A day after Yanukovich fled, parliament named its new speaker, Oleksander Turchinov, as interim head of state. An ally of Tymoshenko, he aims to swear in a government by Tuesday that can run things until a presidential election on May 25.
Whoever takes charge faces a huge challenge to satisfy popular expectations and will find an economy in deep crisis, with state debt payments of around $6 billion due this year.
The Finance Ministry said it needed $35 billion in foreign assistance over the next two years and appealed for urgent aid in the next one or two weeks. It called for a donors' conference involving representatives of the European Union, the United States and the International Monetary Fund.
French Foreign Minister Laurent Fabius told reporters in Beijing the idea was under discussion and "this should be worked out in the coming days".
The cost of insuring Ukraine's debt fell on hopes that the country would now receive aid and avoid default, while bonds recorded gains on expectations that a new government would focus on the economy.
Ukrainian stocks soared to their highest since September 2012, But the hryvnia currency tumbled to a five-year low against the dollar as expectations grew the new government would focus on using dwindling foreign reserves to repay debt rather than defend the currency.
Scuffles in Crimea and some eastern cities between supporters of the new order in Kiev and those anxious to stay close to Moscow revived fears of separatism. A week ago those concerns were focused on the west, where Ukrainian nationalists had disowned Yanukovich and proclaimed self-rule.
President Barack Obama's national security adviser, Susan Rice, was asked on U.S. television about the possibility of Russia sending troops to Ukraine, which President Vladimir Putin had hoped Yanukovich would keep closely allied to Moscow.
Yanukovich's flight left Putin's Ukraine policy in tatters, on a day he had hoped eyes would be on the grand finale to the Sochi Olympics. The Kremlin leader spoke on Sunday with German Chancellor Angela Merkel, whose foreign minister had brokered a short-lived truce in Kiev on Friday.
They agreed Ukraine's "territorial integrity" must be maintained, Merkel's spokesman said.
It is unlikely the United States and its allies in NATO would risk an outright military confrontation with Russia, but such echoes of the Cold War underline the high stakes in Ukraine, whose 46 million people and sprawling territory are caught in a geopolitical tug of war.
In Russia, where Putin had wanted Ukraine as a key part in a union of ex-Soviet states, the finance minister said the next tranche of a $15 billion loan package agreed to in December would not be paid, at least before a new government is formed.
REUTERS
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