A senior Kurdish official says Turkish forces have once again fired shells into Syrian towns controlled by Kurdish forces, violating a ceasefire that has recently come into effect in the Arab country. "The first violation of UN Security Council Resolution 2268 has been made by Turkey. Its troops shelled the cities of Tal Abyad and Uslub,” head of the Syrian Kurdish mission to Moscow, Rodi Osman, told Russia’s Interfax news agency. He added that Turkey must be urged to stop "violating Syria's sovereignty." The comments come as a ceasefire agreed by the United States and Russia took effect in Syria on February 27 midnight Damascus time. The Syrian government also accepted the terms of the truce on condition that military efforts against Daesh and the al-Nusra Front Takfiri militants, who are not included in the ceasefire agreement, continue. A few days before the implementation of the truce, Turkey’s President Recep Tayyip Erdogan compared the Kurdish People’s Protection Units (YPG) and its affiliate, the Democratic Union Party (PYD), with Takfiri terror groups in Syria, saying if Daesh and al-Nusra are kept outside the truce, “then the PYD-YPG must similarly be excluded from the ceasefire for it is a terrorist group just as they are.” Ankara regards the YPG and PYD as allies of the Kurdistan Workers' Party (PKK), which has been fighting for an autonomous Kurdish region inside Turkey since the 1980s. The YPG, which is nearly in control of Syria’s entire northern border with Turkey, has been fighting against Daesh Takfiri terrorists.