Afghan President Hamid Karzai said Friday he would not be rushed into signing a pact to allow US troops to stay on after next year, warning against attempts at "intimidation". "Aggressive rhetoric won't work... We are not a nation that is known for giving into intimidation," added Karzai in an interview with India's NDTV network. "We will sign it when we feel sure that our signature will bring peace and security," added Karzai ahead of talks in New Delhi with Indian Prime Minister Manmohan Singh.