Kerry was due to meet Thursday to discuss the issue with his counterpart from China, which has welcomed the agreement but has sided with Russia in its resolve to veto any UN Security Council resolution against Syria.
Fighting has worsened in Syria as the diplomatic wrangling goes on and Turkey said it shot down a Syrian military helicopter on Monday after it entered Turkish airspace.
The Syrian MI 17 helicopter was detected two kilometres (1.2 miles) inside Turkish airspace and shot down by two F 16 jets five minutes later after failing to heed warnings, Deputy Prime Minister Bulent Arinc told reporters.
“It was continuously warned by our air defence,” Arinc said, adding there was no information about the fate of its crew because the helicopter fell on Syrian soil.
Arinc said Turkey has changed its military rules of engagement in response to repeated gunfire from the Syrian side.
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