The so called TW deterrence is based on the Ti Ching MRBM program. The first test launched appeared to have occurred in Sept 2003 with a range of 900km (expected range is supposed to be between 1000-1500km). There were reports then, but they seems to be confused with the LACM program.

I am surprised that there is no US pressure to end this program since it had been openly reported in Janes entry on ROC and they did pressure TW to end the earlier Tien Ma system