Modern warfare

The sinking of the Russian ship in the Black Sea adds credence to the idea of a new kind of warfare. First the handheld rockets that can destroy tanks, followed up by the handheld missiles that can bring down an airplane and now a handheld rocket that can sink a ship. It doesn't make much sense to build war machines that cost millions that can be brought down by rockets that cost thousands. They say the generals always fight the last war as happened in WW 1 where ground troops were slaughtered by machine guns. Will future generals try to hold on to ships and planes. It appears the Ukrainians who have been trained by the US Green Beret are ahead of the game in the use of modern high tech weapons.