Editor's note: Zhang Xiaoming, deputy director of the Hong Kong & Macao Affairs Office of the State Council, on Monday addressed a keynote speech at a webinar marking the 30th anniversary of the promulgation of the Basic Law.

Below are the highlights of his keynote speech at a webinar held by the HKSAR government to mark the 30th anniversary of the Basic Law's promulgation.

Zhang Xiaoming, deputy director of the Hong Kong & Macao Affairs Office of the State Council, stressed that national security is vital to the successful implementation of "one country, two systems" in the Hong Kong Special Administrative Region.