Sheikh Mohamed bin Zayed received a phone call from Saudi Crown Prince Prince Mohammed bin Salman, one of several world leaders to wish him well after he became UAE President on Saturday.
Prince Mohammed congratulated Sheikh Mohamed and the people of the UAE on his election, and prayed to Allah Almighty to grant more security, prosperity, stability and prosperity to the Emirates.
These included Sultan Haitham, the Ruler of Oman, Jordan's King Abdullah, Egyptian President Abdel Fattah El Sisi and Dr Barham Salih, the Iraqi President.
Sheikh Khalifa's death was announced on Friday by the state news agency Wam.
The Ministry of Presidential Affairs said there will be 40 days of official mourning with flags at half-staff, and three days of closure of ministries and official entities at the federal and local levels as well as the private sector.
The official mourning period began on Saturday with normal working hours resuming on Tuesday.