Iranian Foreign Ministry spokesman Bahram Ghasemi said the planned Kurdish-led force will further complicate the conflict in Syria and is a "blatant intervention" in that country's internal affairs. Ghasemi's comments were carried by Iran's official IRNA news agency.
Iranian President Hassan Rouhani later told the visiting Syrian parliament speaker that the US plan is a "plot" against Syria's territorial integrity and security, according to comments posted on the president's website.
Turkish President Recep Tayyip Erdogan on Monday vowed to "drown this army of terror before it is born." He warned US troops against coming between Turkish troops and the Kurdish forces in Syria that Ankara views as an extension of Turkey's own Kurdish insurgency.
Turkey has threatened to launch a new military operation against the main Syrian Kurdish militia, known as the People's Defense Units, or YPG, in the Kurdish-held Afrin enclave in northern Syria.
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UN chief Guterres told reporters at U.N. headquarters in New York that "too many countries have had troops in Syria."
"I think if the Syrian people could be able to solve alone its (cq) problems, it would probably be much better," he said.
Syria's deputy foreign minister, Faysal Mekdad, denounced the nascent US force and said anyone who cooperates with it is a "traitor" who would meet defeat and death. Russia has criticized the plan as well, saying it could fuel tensions around Afrin.
Some 230 cadets have already been recruited to the new border force, according to the coalition.
Elsewhere in Syria, two civilians were killed and three others were wounded by insurgent shelling of Aleppo city, the state-run news agency SANA reported.
It quoted the Aleppo Police Command as saying that "terrorists" in the western outskirts of Aleppo fired a number of shells, one of which fell on a kindergarten bus, killing the driver and a two-year-old child and wounding three teachers.
The media office of the opposition Syrian Negotiations Commission said Tuesday that the next round of Syria peace talks will take place in Vienna later this month.
A Vienna venue for the indirect talks between the Syrian government and the opposition would be a first under the mediation of UN special envoy for Syria Staffan de Mistura.
His office declined to comment. De Mistura's team has hosted eight rounds of largely unproductive talks over the past two years in Geneva.
The UN has asked both sides not to impose any preconditions for talks and he said in light of that he will not impose a precondition on whether Syrian President Bashar Assad should remain in power or step down.
The UN said yesterday that fighting between government forces and insurgents in northwestern Syria has displaced more than 200,000 people since mid-December, including some who had already fled fighting elsewhere. Most are heading for safer areas near the Turkish border.
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