That's what aircraft and missiles are invented for.
Sea superiority is also important. For aircraft to be fast and weapon loaded, the fuel capacity and range would have to be limited. 70% of earth are seas and 100% within striking range from the seas. That's what aircraft carriers, missile frigates and submarines are invented for.
But the above are the aggression part of the equation of war. Defence need less, if properly strategised. It's always homeground advantage as to logistics, proceedings and outcome, but that also come with the price of heavier homeground damage and casualty whether in victory or defeat. The best defence is to give nobody any reason to attack you.