Hong Kong Chief Executive John Lee Ka-chiu vowed on Tuesday to lead the city to surmount difficulties and embrace new chances to drive high-quality development, while urging Hong Kong residents to adopt flexible mindsets in the face of new challenges.Lee was responding to calls made by Xia Baolong — the nation's top official overseeing Hong Kong and Macao affairs — in a video speech at the opening ceremony of National Security Education Day celebrations in Hong Kong on Monday.Xia, director of the Hong Kong and Macao Work Office of the Communist Party of China Central Committee and the Hong Kong and Macao Affairs Office of the State Council, called on the Hong Kong Special Administrative Region to firmly uphold the bottom line of national security, stay united, and adopt new mindsets to boost the economy and tackle deep-seated issues.Speaking to reporters ahead of a regular meeting of the Executive Council on Tuesday, Lee said Xia's words served as encouragement for the whole of Hon
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