BRUSSELS - The world's leading industrialized nations meet without Russia for the first time in 17 years on Wednesday, leaving President Vladimir Putin out of the talks in retaliation for his seizure of Crimea and Russia's part in destabilizing eastern Ukraine.
The two-day Group of Seven summit, taking place in Brussels rather than the previously planned Russian Black Sea resort of Sochi, will cover foreign policy, economics, trade and energy security.
The latter is an issue of particularly high sensitivity to Europe after months of tension with Moscow, which supplies nearly a third of Europe's oil and gas.
While it is the first time Russia will not be at the table since joining the club in 1997, Putin will still hold one-on-one talks with German Chancellor Angela Merkel, Britain's David Cameron and French President Francois Hollande this week, on the sidelines of the 70th anniversary of the D-Day landings.
The decision to drop Russia from the group was taken by its other members - the United States, Germany, France, Britain, Canada, Japan and Italy - in March, after Moscow seized Crimea and annexed it, a move not recognised internationally.
Since then, the EU and the United States have imposed travel bans and asset freezes on senior Russian and Crimean officials and threatened to apply much harder-hitting economic and trade measures if Moscow is deemed for have further destabilized eastern Ukraine.
While Russia retains substantial forces on Ukraine's eastern border, and pro-Russia militias are operating in many towns, presidential elections took place relatively peacefully across the whole of Ukraine last month, which the West took as a signal of Moscow's readiness not to escalate the crisis.
That sense of increased cooperation has raised questions about whether the European Union, with its critical trade and energy ties with Russia, could soon seek ways of drawing Moscow back into the fold, such as allowing it to rejoin the G8.
Officials responsible for coordinating this week's summit did not rule that out on Tuesday, but said Moscow had a long way to go to prove its intentions were sound and that it was capable of acting like a "normal democratic country".
"It's a bit early at this stage, but I wouldn't rule out the heads of state discussing how they see the future of the G7 or the G8," said one European official.
"It was Russia that distanced itself from the G8 via its actions in Ukraine. It is up to Russia to behave in line with international law and the values of the G8. That would be the prerequisite for the G8 to become the G8 again."
At the same time, another official added: "We cannot exclude that if there is an aggravation of the situation, the EU or the G7 will have to consider further measures against Russia."
Russia denies that it is behind the revolt in eastern Ukraine. It also asserts the right to protect Russian-speakers in the region.