Istanbul (CNN) -- Western leaders roundly condemned the downing of a Turkish military fighter jet by Syria ahead of a NATO meeting on Tuesday on the issue. U.S. Secretary of State Hillary Clinton on Sunday said she had spoken with Turkish Foreign Minister Ahmet Davutoglu about Friday's incident. "The foreign minister briefed me on the specifics of the incident, including that the Syrian military shot its plane down without warning," Clinton said in a statement. "The United States condemns this brazen and unacceptable act in the strongest possible terms. It is yet another reflection of the Syrian authorities' callous disregard for international norms, human life and peace and security."
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NEW: The United States calls shooting down the plane "a brazen and unacceptable act"
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NATO will meet Tuesday under an article dealing with security threats to members
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The military jet is found about 1,300 meters (4600 feet) underwater
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Turkey will respond "decisively," Foreign Minister Ahmet Davutoglu says
"@placeholder has been a leader in the international community's effort to address the Syrian regime's violence against its own people."