Pakistan's response is offensive and as well as defensive.
Pakistan possess ballistic missiles in all spectrum ie short, medium and long range. All can carry nuclear warheads, both tactical and strategic. Pakistan also possess air, sea and land launch cruise missiles capable to carry both conventional and nuclear warheads. Recent mod and test of sub sea launch of cruise missile reveals Pakistan's ability of second strike. MIRV is another tech which Pakistan is exploring and I am sure there will be ballistic missiles carrying MIRV warheads in future years.
Of course India is also progressing in this race.
But Pakistan need to counter the threat coming from India in the form of ballistic missiles and cruise missiles (supersonic and subsonic). For that Pakistan is improving its air defence. For this PAF, PA and PN are inducting various systems to detect, and respond the incoming enemy threats. Recent visit of COAS to PAF and "inauguration" of integrated air defence battle management system in PA are few visible steps.