The leaders of the United States and a handful of European nations have made clear their "determination to act" against Russia.
Following a conference call on Monday, U.S. President Barack Obama, German Chancellor Angela Merkel, French President Francois Hollande, British Prime Minister David Cameron and Italian Prime Minister Matteo Renzi agreed to place additional, as yet unspecified, sanctions on the Russian economy this week.
Western leaders are increasingly certain that Russian President Vladimir Putin has strong links to the downing of Malaysia Airlines Flight 17 due to his support for pro-Russia separatists in eastern Ukraine.
The leaders also called for unrestricted access to the MH-17 crash site.
Washington says its intel shows Moscow is continuing to transfer heavy weaponry and fighters across the border to aid pro-Russia separatists, and has stationed Russian troops near the border in possible preparation for a further incursion into Ukraine.
European leaders made clear last week that they were willing to target financial, defense and energy sectors of Russia's economy, but some European countries remain wary of backing new measures that could restrict trade across entire industries and hurt the European economy.
Song Ji-sun, Arirang News.