During peace talks , suicide car bomber in Syria kills people near mosque , official says . U.N. officials fear violence and mass exodus at Russian military buildup . Russia : Russians ` ` need to back up ... words with actions ( CNN ) -- , '' U.S. official says . Two warring sides blames each other for the lack of progress in peace talks .
During peace talks , suicide car bomber in Syria kills people near mosque , official says . U.N. officials fear violence and mass exodus at Russian military buildup . Russia : Russians ` ` need to back up ... words with actions , '' U.S. official says . Two warring sides blames each other for the lack of progress in peace talks .