(Adds U.S. statement to the OPCW In paragraphs 11-12, 17)
By Michelle Nichols
UNITED NATIONS, Feb 21 (Reuters) - Syria has submitted a new 100-day plan for the removal of its chemical weapons after failing to meet a Feb. 5 deadline, but the international mission overseeing the operation believes it can be done in a shorter time frame, diplomats said on Friday.
The Organization for the Prohibition of Chemical Weapons executive committee met on Friday in The Hague to discuss the joint OPCW and U.N. mission amid growing international frustration at Syria falling behind on its commitments.
The Syrian government, locked in a three-year-old war with rebels seeking President Bashar al-Assad's overthrow, failed to meet the Feb. 5 OPCW deadline to move all of its declared chemical substances and precursors out of the country.
The final deadline under the OPCW plan is for all of Syria's declared chemical materials to be destroyed by June 30.
"The Syrian 100 day plan for removal of the chemicals, on which we have been briefed, is not adequate," Philip Hall, head of the British Foreign Office Counter Proliferation Department, told the OPCW, according to a copy of his statement.
"We now urge the Syrian authorities to accept the proposals submitted by the Operational Planning Group that provide for removal in a much shorter time frame, without compromising on security," he said.
A senior U.N. diplomat, speaking on condition of anonymity, said the international mission believes the operation can be carried out before the end of March, adding that Syria's proposed end-May deadline would not leave enough time for the chemicals to be destroyed before the end of June.
The OPCW declined to comment on Syria's proposal.
The United States has sent the MV Cape Ray, a ship outfitted with special equipment to neutralize the worst of Syria's chemicals at sea, and says it will need 90 days to complete the destruction.
Assad agreed to destroy his chemical weapons following global outrage over a sarin gas attack in August. The world's deadliest chemical attack in 25 years, it sparked a U.S. threat of military strikes which was dropped after Assad's pledge to give up chemical arms.
"The international community has put into place everything that is necessary for transport and destruction of these chemicals. Sufficient equipment and material has been provided to Syria. The ships to carry the chemicals away from Syria are waiting," said Robert Mikulak, U.S. ambassador to the OPCW.
"The U.S. ship to destroy CW agent and precursors is now in the region and waiting. Commercial facilities to destroy other chemicals have been selected and contracts awarded; they are waiting. And yet Syria continues to drag its feet," he said.
'DELAYS NOT INSURMOUNTABLE'
U.N. disarmament chief Angela Kane said on Thursday in New York that any new plan would need to be endorsed by the OPCW and the U.N. Security Council.
The deal for Syria to give up its chemical weapons, brokered by the United States and Russia, was enshrined in a U.N. Security Council resolution in September.
The resolution does not authorize automatic punitive action in the form of military strikes or sanctions if Syria does not comply. At Russia's insistence, the resolution makes clear a second council decision would be needed for that.
Russia has made clear, however, it would not support the use of force against Assad's government, a close ally.
Of Syria's 1,300 tonnes of declared chemicals, Mikulak said, 95.5 percent of the worst toxins and 81.1 percent of the so-called priority two chemicals remained in the country. The worst chemicals are supposed to be destroyed by the end of March and the rest of the arsenal by the end of June.
"Syria should revise its 100-day transport schedule to embrace the recommendations developed by the OPCW, the UN ... to expedite removal," said Mikulak.
Sigrid Kaag, head of the international mission, said earlier this month that she did not believe the Syrian government was intentionally delaying the removal of its arsenal, but that accelerated cooperation was vital to meet the mid-year deadline.
"Intermediate milestones ideally should have been met, they have not been met, there are delays," she said. "Delays are not insurmountable. Delays have a reason, there's a rationale, there's a context."
U.N. Secretary-General Ban Ki-moon said in a report last month that Syria has enough equipment to transfer the chemicals out of the country. Syria has blamed the delays on security concerns, a lack of equipment and the weather. (Additional reporting by Lesley Wroughton and Sara Webb; Editing by David Gregorio and Mohammad Zargham)
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