MOSCOW, May 29. /TASS/. Russian and U.S. top diplomats, Sergei Lavrov and John Kerry, had a telephone conversation on Sunday to discuss the situation in Syria and Russia’s initiatives on joint operation against terrorist organizations and other armed groups that violate the ceasefire in Syria, the Russian foreign ministry said.
"Sergei Lavrov once again stressed the necessity of the soonest closure of Syria’s border with Turkey from where infiltration of militants continue and of Washington’s keeping its promise to dissociate Syrian opposition groups it has contacts with from Jabha al-Nusra terrorists who are not covered by the ceasefire," the ministry said.