I think you worry too much. It isn't an ICBM but an IRBM with a range of a few hundred miles. It could reach Japan's southern coast...
OTR radar was tried at Orfordness in the UK during the 60's and 70's, it was a VLF radar called Cobra Mist. It was so powerful that shipping was banned for12 miles out to sea, the VLF radiation would have killed any sailors who got too close. It a National Trust property now.