"We have no option but to get back what was occupied. Otherwise, the state of war will go on forever," Budanov told the paper. Ukraine held a peace summit in Switzerland earlier this month to rally support for its peace formula, which includes restoring its national borders. Russia was not invited to the event in Switzerland. During the interview, the military intelligence chief also expressed a belief that Russian President Vladimir Putin would not use tactical nuclear weapons on the battlefield. "What use would it have? We don’t have big concentrations of troops for which such nuclear weapons would be appropriate," Budanov said, adding that breaking through Ukrainian defense lines could be done with conventional weapons, avoiding large political risks.Budanov also spoke of the need to use long-range weapons to attack Russian soil, which Ukraine has increasingly done in recent months.