“If we wanted to give up, we would have done so at the very beginning. We are on guard for our country. This issue is not up for discussion,” he was reported as telling visiting Russian parliamentarians, days ahead of an internationally sponsored peace conference on Syria.
The United Nations hopes the talks will bring about a political transition in the country, and U.S. Secretary of State John Kerry said last week that Syria’s future had no place for Assad.
Syria, however, said in a letter to UN Secretary-General Ban Ki-moon last week that its focus at the peace conference would be on fighting “terrorism”.
Syria’s main political opposition group in exile agreed on Saturday to attend the talks and said three rebel fighting forces also wanted to take part.
Opposition groups have previously demanded the removal of Assad as a condition of any discussions on a possible transitional government.
But the Syrian National Coalition, the exiled opposition body, announced on Saturday that it would attend the talks.
The decision was praised by the US which, with Russia and the UN, is taking a leading role in organising the negotiations.