Russian Foreign Minister Sergei Lavrov discussed the Syrian conflict with his American counterpart, Secretary of State John Kerry, for the second time in four days Wednesday, AFP reported.<br />The phone call came amid concerns in Washington over an alleged Russian military buildup in the war-torn country.<br />The two discussed "the problems of regulating the conflict in Syria," the foreign ministry in Moscow said in a terse statement, without providing further details.<br />The New York Times reported late last week that Russia had sent a military advance team to its ally Syria and was taking other steps that Washington fears may signal plans to vastly expand military support for the beleaguered Assad.