In all honesty, i didn't really like the concept of Antasena as a missile boat, keep those thing close to the shore and strait for patrol and anti piracy mission.
We're assuming that the "fast missile boat" mentioned in the TNI-AL press release was Antasena which either can be true or not. However given the size of the missile, we can be sure that it can be fitted to other platform like KCR-60 and so on.
Re: Antasena, I believe it can do its job most effectively in and around our littoral area (i.e. not too far from the shore). Given that the cannon armed version must be within visual range from its target to use its gun, a missile armed one can deliver more punch from a far greater distance.
Of course, for this version to be effective, we'll also need some kind of long range detection methods either by coastal and airborne radars, satelitte, our submarines shadowing enemy forces at sea, and so on.
If we are talking about capable adversaries, why do they even need to sail close to our coast (12NM), at least during the early phase of the war, when their long-range strike capability allow them just to sit inside or even outside our EEZ
That's exactly what i mean, nowadays there is many Navy and air force in the region Fielded capable platform able to launch long range Cruise Missiles and AShM to perform saturation attack from over the horizon.
To name a few in the region is, Australia, China, USA, India, South Korea etc.
I didn't wrote my post earlier with the intention for us to deploy fast missile boats as our first line of defense. In case of an all-out war against technologically advanced adversaries, we can almost guarantee that our first line of defense (that is large surface combatants, long range fighters etc) will be hard pressed to find and destroy such threats if they launched their attacks while they're not even inside our EEZ.
While their long-range attacks will be effective against our fixed installations, small and mobile forces will be much harder to detect and destroy
especially if they can use their size advantage to hide themselves from enemy's various detection methods and attempts to find them.
In cases where we can no longer prevent enemy invasion fleet from entering our territory, as long as we can maintain some kind of long range detection as I mentioned earlier in this reply, fast missile boats armed with AShM can come into play to atleast try to cause a lot of damages to the enemy's invasion fleet before they can even see our coastline.
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would push so hard. All of the time it's still push and pull between 
Type 214 and 
KSS.
