No one really knows. The only time it has been managed was once and that relied on having a tracking device on the ICBM, on it's source, path and target being know before time and on it following the simplest possible trajectory. And that's assuming the Koreans only launch 1, presumably if this thing works in June, they will make more than 1...

It's surprising how many systems there are (Russian, French, British, US, Chinese, Indian etc) and how rarely anyone dares to actually do a public test...