Japan seems to be having more success: https://www.futura-sciences.com/en/this-new-japanese-weapon-can-neutralize-the-fastest-machine-ever-created_17488/

Still, the technical challenges are exactly the same. While I can’t find many more details, it being ship mounted is a significant step forward and it seems to imply that some of the more serious issues have been solved. (A demonstration is just a demonstration and anything other than it being able to hit a target ship is just speculation.)

The art of war is extremely complex and there is no way to cover everything in one Lemmy comment.

However, I can summarize: An attacker or defender simply needs to prevent the opposing side from being able to support a war.

While there are thousands of different things that can support war, it usually boils down to raw manpower, food/supplies, weapons, energy, logistics and communications. Failing to defend, or not having the capability to replenish/repair those things is usually a quick game-over as those items are highly dependent on the other. Anything that supports those key items is a target of the enemy, so those are the things that are stockpiled, fortified or should be rebuilt quickly.