NATO occupation troops are paying high price in Afghanistan.

Two NATO occupation soldier were killed in Afghanistan, taking the death toll of foreign troops to 643.

NATO's International Security Assistance Force (ISAF) had announced the deaths of five soldiers on Sunday. On Monday the force said "two additional" troopers had died the same day.

A total of 643 foreign troops have now been killed in Afghanistan this year, compared to 521 killed last year, according to an AFP count based on the independent icasualties.org website, which tracks coalition fatalities and injuries.