Muscat: His Majesty Sultan Haitham bin Tarik has sent a cable of greetings to Duke Henri of the Grand Duchy of Luxembourg on the occasion of Luxembourg's National Day. According to Oman News Agency, in the cable, His Majesty the Sultan expressed sincere sentiments and best wishes to Duke Henri, wishing Luxembourg continued progress and prosperity. His Majesty also commended the advanced relations between Oman and Luxembourg, expressing hope that these ties would continue to grow and prosper to serve the joint interests of both nations.