GENEVA—U.S. Secretary of State John Kerry met Monday with this Russian counterpart in what appeared to be less than amicable talks amid continuing tensions over Ukraine and American calls for a full probe into the murder of a prominent opposition figure [Boris Nemtsov] in Moscow.Neither Kerry nor Russia's Foreign Minister Sergey Lavrov smiled or spoke substantively as they shook hands before photographers at a Geneva hotel on Monday, less than a week after Kerry told Congress that Russian officials have lied to his face about Moscow's role in Ukraine.That comment drew a rebuke from the Russian foreign ministry. U.S. officials have pointed out that Kerry did not specifically accuse Lavrov of lying to him. They say he was referring to public statements and media reports, although Lavrov is the only Russian official Kerry is known to have met face-to-face in recent months. The pair last met in February on the sidelines of an international security conference in Munich shortly before a new Ukraine ceasefire agreement was reached.