Part of an E-Trade commercial scheduled to air during the Super Bowl on Sunday is seen here. E-Trade/AP
Kiss member Gene Simmons appears in a Dr. Pepper ad scheduled to air during the Super Bowl. Dr. Pepper Snapple/AP
One of the six finalists in the fourth annual Doritos 'Crash the Super Bowl' challenge is shown here. Three Grand Prize Winners' commercials will run during the Super Bowl. Doritos/AP
One of Coca Cola's ads for the 2010 Super Bowl features characters from 'The Simpsons.' Coca Cola Co./AP
Shown here is Denny's 2010 Super Bowl 'Chicken Warning' commercial. Business Wire/AP
Chevy Chase and Beverly D'Angelo appear in an ad for vacation-rental website HomeAway. The ad for the 5-year-old company features the Griswold family from the movie 'National Lampoon's Vacation.' HomeAway/AP
Part of Kia's television ad scheduled to air during the Super Bowl is shown here. Kia/AP
Part of Boost Mobile's Super Bowl advertisement is seen here. Boost Mobile/AP
A scene from Dove's Super Bowl commercial is shown here. Dove/AP
Brothers Stephen (l.) and William Baldwin appear in a KGB commercial. KGB/AP
Actress Betty White appears in a Snickers Super Bowl commercial. Snickers/AP
A scene from a Teleflora ad scheduled to air during the Super Bowl is shown here. Teleflora/AP
In this image provided by Electronic Arts, part of the video game Dante's Inferno is shown here. Electronic Arts/AP
Recording artists and producer will.i.am remixes The Who's iconic song 'My Generation' for a FLO TV ad set to debut during the Super Bowl on Sunday. The full-length single will be available for purchase with all proceeds benefiting Oxfam's Haiti Earthquake Response Fun. Qualcomm Incorporated/PRNewsFoto
Obama phoned Russia's Vladimir Putin Thursday to discuss a US proposal for resolving the Ukraine crisis. Earlier, the US moved to begin a regimen of sanctions against Russia. Will those be enough to prevent Russia's annexation of Crimea?
[Updated 9:30 p.m. ET] President Obama appealed to Russian President Vladimir Putin late Thursday, during a personal phone call, to agree to direct talks with Ukraine aimed at resolving, through diplomacy rather than military confrontation, Russia's concerns about the future direction of the Ukrainian government and of the rights of ethnic Russians living in Ukraine.