To attract them, you've got to talk to them about the things they're interested in first. Only when they find out that you have something useful to say to them will they be willing to talk to you and believe what you have to say. Then you can tell them a little about the ROC "by the way."
要吸引他，得先跟他談他有興趣的話題，等到他發現你對他的問題懂得比他多，覺得「跟這個人談對我有好處」，然後他願意和你談、願意相信你的話，這時才「順帶」告訴他一點中華民國的事。