Western leaders said they stood united Thursday ahead of their first direct meetings with Russian leader Vladimir Putin on Ukraine, with President Barack Obama giving him a month to back down or face more sanctions.
British Prime Minister David Cameron said Wednesday that G7 nations meeting next week must discuss the permanent expulsion of Russia from the wider G8 if it takes further action to destabilise Ukraine.
The OECD provided ammunition Tuesday for an expected G8 offensive against tax evasion in a report outlining how to bring about automatic sharing of financial information that would shoot a hole through banking secrecy.
Vladimir Putin's participation in the first G8 summit of his new term was supposed to seal his comeback to the global stage as Russia's paramount leader after winning a third presidential term last year.
World leaders head to the G8 summit in Northern Ireland on Monday looking to put pressure on Russia to back away from its support of Syrian President Bashar al-Assad amid growing Western efforts to arm the rebels.
Leaders of the G8 nations meet in Northern Ireland next week determined to crack down on tax evasion and boost global trade, while seeking to push Russia to help find a political solution to the Syria conflict.
Eight of the world's most powerful leaders will shut themselves away in splendid isolation for the G8 summit from Monday in a resort in a picturesque area of Northern Ireland that was once a bastion of the Irish Republican Army.
British Prime Minister David Cameron called on his fellow G8 leaders on Wednesday to start work now on agreeing "bold steps" to help boost global economic growth, ahead of a summit he will host in June.