The European Union signed an historic free-trade pact with Ukraine on Friday and warned it could impose more sanctions on Moscow unless pro-Russian rebels act to wind down the crisis in the east of the country by Monday.
Ukrainian President Petro Poroshenko came to Brussels to sign a far-reaching trade and political cooperation agreement with the EU that has been at the heart of months of deadly violence and upheaval in his country, drawing an immediate threat of "grave consequences" from Russia.
Georgia and Moldova signed similar deals, holding out the prospect of deep economic integration and unfettered access to the EU's 500 million citizens, but alarming Moscow which is concerned about losing influence over former Soviet republics.
EU leaders meeting in Brussels demanded that, by Monday, Ukrainian rebels agree to ceasefire verification arrangements, return border checkpoints to Kiev authorities, free hostages and launch serious talks on implementing Poroshenko's peace plan.
"We expect progress in the next hours," German Chancellor Angela Merkel said. "If we don't see any steps forward on any of the points, then we are also prepared to take drastic measures."
EU leaders said they were ready to meet again at any time to adopt significant sanctions on Russia. Diplomats said they could target new people and companies with asset freezes as early as next week. More than 60 names are already on the list.
Although it has drawn up a list of hard-hitting economic sanctions against Russia, the EU is still hesitating over deploying them because of fears among some member states of antagonizing their major energy supplier.
"We are talking about possible sanctions against Russia but we do not have to introduce sanctions for the sake of sanctions. We do have a need for a dialogue. I hope this dialogue will take place and we will have a real ceasefire," Poroshenko told a news conference in Brussels.
Poroshenko has drawn up a 15-point peace plan to defuse the crisis in eastern Ukraine, where hundreds of people have been killed in clashes between security forces and pro-Russian rebels. A week-long ceasefire is due to expire later on Friday.
Poroshenko said on Friday he would take a decision on extending a ceasefire in the east of the country when he returns to Kiev following an EU summit in Brussels.
But, according to two EU diplomats, Poroshenko told the leaders of France and Germany he was proposing to extend the ceasefire by 72 hours, coinciding with the EU's deadline.
Ukraine, Georgia and Moldova have made clear their ultimate goal is EU entry but Brussels, under pressure from voters weary of further expansion, has made no promise it will allow them in.
Ukraine's former pro-Moscow President Viktor Yanukovich turned his back on signing the EU agreement last November in favour of closer ties with Moscow, prompting months of street protests that eventually led to his fleeing the country.
Soon afterwards, Russia annexed Ukraine's Crimea region, drawing outrage and sanctions from the United States and EU, and pro-Russian separatists began an uprising in eastern Ukraine.
"Over the last months, Ukraine paid the highest possible price to make her European dreams come true," Poroshenko said, calling Friday's accord the most important day for his country since independence from the crumbling Soviet Union in 1991.
Symbolically, he signed the agreement with the same pen that had been prepared for Yanukovich to sign the document last year.
Russia's Deputy Foreign Minister Grigory Karasin immediately said the signing would have "grave consequences" for Ukraine, Interfax news agency reported.
Poroshenko urged the EU to reward Ukraine for its sacrifices by promising the country would be eligible for membership of the EU once it was ready. The pledge would "cost the EU nothing but would mean the world to my country", he said.
European Council President Herman Van Rompuy said Friday's deals were "not the final stage of our cooperation", but this fell short of the prospect of ultimate EU membership.
Moldovan Prime Minister Iurie Leanca has also set his sights on EU membership, saying on Thursday that he hoped his country would apply to join in the second half of 2015.
Russia, which fought a war with Georgia in 2008, has met previous attempts by its neighbours to move closer to the EU with trade reprisals. EU officials fear it could happen again.
EU officials say that, in diplomatic talks, Russia has threatened to withdraw the duty-free treatment that Ukraine currently benefits from as a member of the Commonwealth of Independent States (CIS) free trade pact.
One senior EU official called the Russian threat "deeply shocking" while another said such a move would violate the CIS agreement and World Trade Organisation rules.
If Russia imposed customs duties, it would put at risk some of Ukraine's exports, which mainly consist of base metals, grains, machinery, equipment and processed food. Ukraine sends 24 percent of its exports to Russia, worth $15 billion a year.
Moscow fears Ukraine may re-export EU products to Russia, avoiding duties that Russia imposes to protect its own output.
Russian energy giant Gazprom cut off gas supplies to Kiev last week after Ukraine failed to pay its gas debts.
The EU exported $33 billion of goods to Ukraine in 2013 and imported 13.8 billion worth, EU data shows.
As part of the deal, the EU will insist that Ukraine meet its standards on human rights and democracy, fights corruption, strengthens the rule of law and reforms its economy.
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