EU leaders will have few options at their disposal and internal differences threatening the bloc's ability to build consensus when they meet to discuss the Caucasus crisis and future relations with Russia on Monday.
Many EU nations agree ties to Russia need to be re-examined after the Caucasus war
The emergency EU summit in Brussels -- the first such crisis meeting since the 2003 Iraq war -- was called by French President Nicolas Sarkozy, in his capacity as current president of the EU, to discuss the war between Russia and Georgia.
It comes after weeks of European shuttle diplomacy in the Caucasus, and just days after Russia appalled Europe by recognizing the independence of Georgia's breakaway regions of Abkhazia and South Ossetia.
At their summit, the EU's leaders are set to raise the stakes by evaluating the consequences of the Georgia-Russia conflict for the whole range of future EU-Russia relations.
But as analysts point out, the EU's options are limited.
Russia holds the cards
Medvedev can largely do as he pleases, most experts agree
"There are very few possibilities for the EU to have an influence on Russian decision-making in a region so close to its borders," Hans-Henning Schroeder, head of the Russia research division at the German Institute for Foreign and Security Policy, told the DPA news agency.
A number of leaders, particularly from Eastern European countries which once belonged to the Soviet Union, have already urged the EU to take a strong line with Russia out of fear that Moscow could decide to treat other neighbors as it did Georgia.
Such concerns have found sympathetic ears in the West.
Russia has "acted outside international law," French Foreign Minister Bernard Kouchner told French radio station Europe-1 on this week after Russia's recognition of the rebels.
"There are other objectives that one can suppose are objectives for Russia, in particular the Crimea, Ukraine and Moldova," he added.
Even Germany's Chancellor Angela Merkel, who has hitherto striven to keep cordial relations with Moscow, reacted to the Russian decision by saying that while dialogue with the Kremlin should continue, the EU cannot go back to business as usual with Russia.
Travel restrictions are one of the few steps the EU could take against Russia
The 27-member bloc has several alternatives at its disposal, analysts say. It could block Russia's membership of international groups such as the Group of Eight and the World Trade Organization (WTO). The bloc could freeze ongoing talks on the renewal of a wide-ranging EU-Russia cooperation agreement; it could introduce trade sanctions; and it could refuse to give Russian citizens visa-free travel to Europe.
But even if leaders agree on any retaliatory measures on Monday, something that is by no means guaranteed, experts wonder whether these are good enough cards to trump Moscow.
Russia is Europe's biggest energy supplier, its biggest neighbor, a huge and growing market and a key diplomatic player in areas such as Afghanistan, the Middle East and Iran.
Russian leaders have already shown that they have no qualms about offending European sensibilities, whether by cutting off energy supplies to Ukraine (2005-06) and Lithuania (2006) or vetoing UN support for the independence of Kosovo (2007).
In addition, Prime Minister Vladimir Putin and President Dmitry Medvedev have already preempted some of the West's threats by declaring the G8 "pointless" and questioning whether joining the WTO would be in Russia's best interest.