A Taliban spokesman denied the losses, and said 11 Afghan servicemen had been killed.
In the same province, a British soldier was killed in a Taliban attack on Monday. Taliban gunmen also killed two policemen and wounded three others in a sneak-raid on a police checkpoint in Helmand on Tuesday morning.
This year has seen the worst violence in Afghanistan since the overthrow of the Islamic Taliban movement in 2001, with the south of the country the worst affected.
A report this month by the International Council on Security and Development think tank said the Taliban had a permanent presence in 72 percent of Afghanistan and were 'closing a noose' around the capital, Kabul.
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The main event of the third day of the 11th meeting of the Valdai International Discussion Club in Sochi was the closing session with President Vladimir Putin. The atmosphere was calm and open, despite the current political tensions and the Russia-West confrontation. The Russian president said that it corresponded to the spirit of the Valdai Club.