Looking for His glorious appearing! Titus 2:13

"We are united in condemning the Russian Federation's continuing violation of the sovereignty and territorial integrity of Ukraine," the United States, Germany, Japan, France, Britain, Italy and Canada said in a joint statement.

"Russia's illegal annexation of Crimea, and actions to destabilize eastern Ukraine, are unacceptable and must stop."

That message was reinforce by President Barack Obama, who said Russia's economy was already suffering and would only suffer more if Putin did not change behavior.

"If Russia's provocations continue, it's clear from our discussions here that the G7 nations are ready to impose additional costs on Russia," he said. "Today, in contrast to a growing global economy, a sluggish Russian economy is even weaker because of the choices made by Russia's leadership."

Putin, who will meet Germany's Angela Merkel, French President Francois Hollande and Britain's David Cameron on the sidelines of 70th anniversary of the D-Day landings in France on Friday, appeared unfazed by the threats.

Asked at an event in St. Petersburg how he felt about being excluded from the G8 for the first time since joining the club in 1997, Putin was typically pointed, barely breaking stride to speak to Kremlin reporters as he left a meeting.