New Saudi King Salman is taking the throne amid an unprecedented period of instability and terrorist threats. (Reuters) ARAR, Saudi Arabia — At 3 a.m. on a cold desert night earlier this month, four Islamic State militants carrying guns, grenades and cash slipped into Saudi Arabia here through a hole in the new heavy fencing that separates this country from Iraq. They were immediately spotted by Saudi border guards in a state-of-the-art control room 35 miles away, appearing first as blips on radar, then as ghostly white figures on night-vision cameras scanning the desolate desert landscape. Heavily armed troops were dispatched to confront them. When the battle ended, the four intruders — all Saudi citizens — and three Saudi soldiers were dead, including the local base commander, who was killed when a militant pretending to surrender detonated a suicide vest. “Thanks to God and our new systems, we are ready […]