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Ukraine's President Petro Poroshenko holds the Presidential stamp during his oath taking ceremony in the Parliament in Kiev on Saturday, June 7, 2014. Image credit: AFP

Photo/Presidential press service. Ukraine's new President, Petro Poroshenko, gets down to work on Sunday, after vowing at his inauguration to avert civil war and mend ties with Russia

as his nation faces disintegration and economic collapse. Poroshenko took the oath of office on Saturday, the day after holding his first meeting with Russian President Vladimir Putin since

a May 25 election victory entrusted him with stemming a bloody crisis that has shaken the post-Cold War order and redrawn Europe's map. The 48-year-old candy magnate – dubbed the

"chocolate king" – first asked a packed session of parliament to observe a minute of silence for the 100 people killed in three days of a brutal crackdown in Kiev that led to the

February ouster of Ukraine's Kremlin-backed regime. The self-made billionaire then vowed to grant amnesty to any insurgents who had "no blood on their hands" as the first step

in a peace initiative designed to save the nation of 46 million – whose Crimea peninsula was annexed by Russia in March – from fracturing further along ethnic lines. "I am assuming the

presidency in order to preserve and strengthen Ukraine's unity," Poroshenko said in a confident address to parliament that symbolically alternated between Russian and Ukrainian. 

"The citizens of Ukraine will never feel the blessing of peace and security until we resolve our relations with Russia," he added. But Poroshenko also said he would never accept

Russia's seizure of Crimea or attempts to divert Ukraine's pro-European course. The new Ukraine leader may meet a Russian envoy on Sunday for the first round of talks aimed at

resolving the crisis between the two neighbours. United States Secretary of State John Kerry, who was in France Saturday for World War II commemorations, congratulated Poroshenko on his

inauguration. "While there is a great deal of work ahead, the path forward President Poroshenko has proposed would lead to a de-escalation of tensions. Ukraine can be a bridge between

Russia and the West marked by strong economic relationships with both sides," he said. Kerry urged Putin "to engage directly" with Poroshenko, halt the flow of arms, and

"take steps to bring an end to the violent acts of Russian separatists in eastern Ukraine". US Vice President Joe Biden attended Poroshenko's inauguration, and the White House

said Biden had pledged an additional $48.0 million in assistance aimed at helping the new leader's team protect Ukraine's eastern border and reduce its costly dependence on

Russian gas imports. But separatist commanders whom the West accuses Russia of openly backing dismissed Poroshenko's presidency as illegitimate.  Separatists in the self-proclaimed

"Republic of Lugansk" called on the new Ukrainian president to withdraw his army from the east. "Negotiations cannot begin until the retreat of the occupying troops from our

territory," said the "president" in Lugansk, Valery Bolotov, in a statement to the press. PRAGMATIC POLITICIAN Poroshenko is one of Ukraine's more experienced

politicians, who held senior cabinet posts under both the Western-leaning government that followed Ukraine's 2004 Orange Revolution and the Moscow-friendly leadership of ousted

president Viktor Yanukovych. That pragmatic approach has instilled hope among many Ukrainians that he will be able to resolve an eight-week secessionist drive by pro-Russian militants in the

eastern rust belt that has claimed 200 lives and grown even more violent since his election. Poroshenko – who has vowed to give up direct ownership of his holdings to avoid a conflict of

interest – must also address a two-year recession and endemic corruption that has turned Ukraine into one of Europe's poorest countries and has fed broad public discontent. He embarked

on his most urgent assignment Friday by shaking hands with Putin on the sidelines of D-Day commemorations in Normandy that were haunted by the spectre of an outright civil war breaking out

on the European Union's eastern edge. Moscow had previously said it was ready to work with the new president, but stopped short of explicitly recognising him as the legitimate leader of

the Ukrainian people. Western powers have threatened to slap punishing new sanctions on entire sectors of Russia's economy should Putin fail to demonstrate a more cooperative approach

by the end of the month. And the Kremlin chief appeared to take the first step in that direction Saturday by ordering the Federal Security Service (ex-KGB) to reinforce its protection of the

Ukrainian border to stem the flow of Russian arms into the separatist east. Mounting tensions in the rebel regions have seen Kiev concede that it was losing control of three border posts

that were being routinely attacked by rebels who had crossed over into Ukraine from Russia. Militants shot down a Ukrainian cargo plane on Friday near Slavyansk – an insurgency stronghold

where many of the 120,000 residents have been forced to spend nights in basements because of the ceaseless fighting. A military spokesman said that three servicemen were killed in the

incident and two remained missing. 'POSITIVE' NORMANDY TALKS Putin sounded a surprisingly upbeat note after Friday's brief chat with Poroshenko – a meeting that he grudgingly

accepted after personal intervention by German Chancellor Angela Merkel. "I cannot but welcome the position of Poroshenko on the necessity to end the bloodletting immediately in the

east of Ukraine," he told reporters in France. But Putin also warned that Russia would have no choice but to slap trade restrictions on Ukraine should it proceed with plans to sign a

historic economic treaty with the European Union in the coming weeks. Poroshenko brushed aside Putin's pressure on Saturday. "We must sign this agreement by June 27 at the

latest," he told a reception of foreign dignitaries after delivering his inauguration address.