Syria has complained to the United Nations after US Senator John McCain, former French foreign minister Bernard Kouchner and other prominent figures entered the country without visas.

Syria has complained to the United Nations after US Senator John McCain, former French foreign minister Bernard Kouchner and other prominent figures entered the country without visas.

Syria's UN ambassador Bashar Jaafari said in a letter to the Security Council that countries must take "immediate measures" against nationals who travel to his country illegally.

Washington's former ambassador to Croatia, David Galbraith, visited Syria in December, and a former Kuwaiti lawmaker, Walid al-Tabtaba'i, was cited for his 2013 trip, in the letter obtained by AFP on Monday.

McCain paid a surprise visit to Syria in May 2013, meeting with anti-government Takfiri militants after crossing the border from Turkey.

Jaafari said the Republican Senator met with leaders of the Al-Nusra Front, which the Security Council has designated a terrorist organization.

Kouchner also traveled to Kurdish areas in northern Syria in November last year.

Galbraith was accompanied by three US political and military officials during his visit last month while Walid al-Tabtaba'i brought money and weapons to the militants, and took part in combat in September 2013, the envoy said.

"Such actions are a blatant violation of Syria's sovereignty and the resolutions of the Security Council concerning Syria," wrote Jaafari in the letter dated December 24.

Syria calls on Secretary-General Ban Ki-moon and Security Council "to put pressure on those Governments to take immediately the necessary measures against their nationals who enter illegally into Syrian territory," he added.