is it correct, I read, the missile can´t be intercepted by any antiship missile system today?
It is wrong. Brahmos is a cool weapon, but fast moving, large Russia missiles have been around since the 60s and defenses have come about to defend against them.
Before Brahmos we saw P-500
P-270
And a host of other such weapons. Because of this threat, existing for decades before P-800 or Brahmos hit the scene, it was imperative to develop countermeasures against them and developed they've become.
For the USN these hardkill countermeasures are:
RAM
And ESSM
Which have successfully and repeatedly demonstrated their ability to destroy supersonic, sea-skimming AShMs by training against Coyote
And a version of Russia's KH-31 called MA-31
Both SM-2 and SM-6 have downed supersonic targets as well:
http://breakingdefense.com/2015/06/supersonic-self-defense-navy-nifc-ca-passes-key-test/
This morning Raytheon announced its Standard Missile-6 destroyed “a medium-range supersonic target” in a June 10 test at White Sands Missile Range in New Mexico. But the SM-6 has hit supersonic targets before.This time the launcher fired the missile at a target “over the horizon,” i.e. one its own sensors couldn’t see. Instead it had to rely on data feeds from distant sensors which could track the target.
Phalanx and other CWIS gun systems may have a harder time against a Brahmos-type target, but that doesn't mean they can't defend against one either.
Don't forget that hardkill is only one part of the equation.
SLQ-32
And Nulka also help defend a ship.
As does SRBOC
New countermeasures are sprouting up too:
http://defense-update.com/20140628_pandarra-fog.html
Brahmos is dangerous, but it's nothing that hasn't been seen before.
These types of threats have existed for decades and countermeasures, hard and soft kill, have been developed, are being developed and are being refined to stop such weapons.
There ships can also shoot down Sun and Moon as well
Hey now, don't give the USN any ideas. SM-3 is already scary enough with ABM and ASAT capabilities. We don't need them going anti-lunar too
!