No single airdefence systems can protect you against a cruise missile attack. You can have the best radar of the world you can not protect, the reaction time against a low flyinh cruise missile to short, as you can see if ther was 10 cruise missile flying they managed to hit 1, maybe 3 in good conditions. The only thing you can do is AWACS flying 24/7, a powerful radar in the ground can not protect.
Russian do not have PGM in stock, they are not able to use ther fighters against Ukrain sam system, so they are using ther cruisemissiles.
As i said, a morden air defence system with network centric capability.
On a relative flat terrains you can detect a cruise missile from 30/40 km away with a good radar as it is usually flies at altitude of 20m to 50m ( as you know, unlike their anit ship counterparts land attack cruise missile cannot fly lower than that for obvious reason ) at speed of mach 0.75 to 0.95, an integrated air defence system will have reaction time of roughly 70 to 90 second.
And this is a big fat window of engagement for modern air defense systems lik s400, mim-104 pac 3, barak 8, iris t slm, sky sebra or hisar o+ given these systems only take 8/10 second to respond.
So, If we do the math for example with the sky sebra, which can guide 24 missile simultaneously and can fire 3 missile per second it will simply run out interceptors before any cruise missile close in within five miles. ( and that would be a clearly a win for air the defense system. )
And Even if it is a much less favorable condition, let's say radar only detected a bunch cruise missile at 20km the window of engagement will be 45 second.
and even in worst condition the if radar detect the missiles only at15km away because of radical mountainous terrain ( but that much late detection is unlikely ) the window will be roughly 35 second and that will be still just enough for sky sebra to expand all of its interceptors.
