Leaders of the West's top economies are set to hold their summer summit in Brussels, not Sochi. 

That's a slap in the face to Russian President Vladimir Putin. 

The U.S. and allies are angry at Russia for annexing the Crimean region of Ukraine. 

President Obama helped convince other G-7 members to move the summit. 

The U.S. is leading international efforts to punish Russia over its actions in Ukraine. 

Obama is meeting with other world leaders this week in Europe.