NEW YORK - Pakistan has to do more to combat terrorists on its soil if it wants to continue to receive substantial U.S. aid, a key U.S. senator reaffirmed Monday in New Delhi as he expressed the view that the Pune blast should not derail the resumption of Indo-Pakistan talks. Pakistan has got to make clear its willingness to take on internal enemies, Sen. Kerry, who is the chairman of the Senate Foreign Relations Committee, said in an interview with The Wall Street Journal. He also said that in his view discussions over Kashmir should not be a prerequisite in the initial conversation between the two nations and that the U.S. stands ready to assist either side if asked. But, he said, I do not think we should impose ourselves in any way. Referring to the weekend blast in Pune, Sen. Kerry said the greatest mistake in responding to another terror strike that emanated from Pakistan would be for the two sides to give those responsible what they seek to achieve: the subversion of democracy and the rule of law. The right thing is to talk; you lose nothing by talking, he said while on a visit to the Indian capital en route to Islamabad. If India finds a Pakistani link to the Pune attack, I hope India will have that conversation with Pakistan and, if they have evidence to that effect, that should be the first thing on the table and Pakistan has to deal with it, he added. The Indian government has yet to assign responsibility for the Pune attacks and no group has claimed responsibility. Authorities said Monday investigations were continuing. In Islamabad, Sen. Kerry said he planned to meet President Asif Ali Zardari and Gen. Ashfaq Kayani, the Army chief.