Leaders from around the world continued to arrive in Abu Dhabi to pay their respects on Sunday following the death of Sheikh Khalifa and the election of the President, Sheikh Mohamed.
From Britain to Israel and India to France, leaders paid tribute to the world's newest head of state.
Senior figures from the US and other nations are expected to follow on Monday on the third day of mourning.
He wished good health and continued prosperity, progress and prosperity to all brotherly and friendly peoples and their countries, state news agency Wam reported.
They included President Mohamed Ould Cheikh El Ghazouani of Mauritania, France's President Emmanuel Macron, and Kassym-Jomart Tokayev, President of Kazakhstan, state news agency Wam reported.
Wavel Ramkalawan, President of Seychelles, and Indian Vice President Venkaiah Naidu also offered condolences.
Qatar's Sheikh Tamim bin Hamad was pictured walking through Abu Dhabi airport with Sheikh Mohamed in his first visit since 2016.
Israel's President Issac Herzog paid his respects alongside two senior ministers. Britain's Boris Johnson travelled from London to meet the new president.
German President Frank-Walter Steinmeier and Morocco's Prince Moulay Rachid met Sheikh Mohamed also in person.
In a message in French and Arabic, Mr Macron said Sheikh Khalifa was "respected by all for the values of peace, openness and dialogue that he embodied".
"My support to his brother, newly elected President of the United Arab Emirates, as well as to the people of the Emirates."
Mr Macron, who was last month re-elected by the French people for a second five-year term, spoke of strong political, business and friendship ties during an extended meeting.
In a tweet, Boris Johnson said: "The UK and UAE will continue to work closely together for our peoples’ security & prosperity."
On Monday, Kamala Harris, Vice President of the United States, will arrive in Abu Dhabi with a delegation of officials.
She is due to meet Sheikh Mohamed and seeks ways to "deepen our ties in the coming months and years", her press secretary said.
Ms Harris will travel with US Secretary of State Antony Blinken, who ahead of the trip said he would look to "build on the extraordinary partnership between the United States and the United Arab Emirates".
In total, dozens of leaders and senior officials travelled to Abu Dhabi.
Sheikh Tamim bin Hamad Al Thani, Emir of Qatar
King Hamad bin Isa Al Khalifa, King of Bahrain
Field Marshal Sheikh Khalifa bin Ahmed Al Khalifa, Commander-in-Chief of the Bahrain Defence Force
Sheikh Mohammed bin Khalifa bin Hamad Al Khalifa, Vice Chairman of the Royal Family Council
Sayyid Asaad bin Tariq Al Said, representative of His Majesty the Sultan of Oman
Marzouq Al Ghanim, Speaker of the National Assembly
Prince Muqrin bin Abdulaziz Al Saud
Prince Salman bin Sultan bin Abdulaziz Al Saud
Prince Mansour bin Saud bin Abdulaziz Al Saud
Prince Mohammed bin Fahd bin Abdulaziz Al Saud
Prince Dr Mansour bin Miteb bin Abdulaziz, Adviser to the Custodian of the Two Holy Mosques, Minister of State, Member of the Cabinet,
Prince Bandar bin Muqrin bin Abdulaziz Al Saud
Prince Khalid bin Salman bin Abdulaziz Al Saud, Deputy Minister of Defence
Prince Moulay Rachid
Mahmoud Abbas, President
Isaac Herzog, President of Israel
King Philip VI of Spain
Frank-Walter Steinmeier, President of the Federal Republic of Germany
Boris Johnson, Prime Minister of the United Kingdom
Dr Bisera Turkovic, Deputy Prime Minister, Bosnia and Herzegovina
Shavkat Mirziyoyev, President of the Republic of Uzbekistan
Joko Widodo, President of the Republic of Indonesia
Shehbaz Sharif, Prime Minister of the Islamic Republic of Pakistan
Dr Abul Kalam Abdul Momen, Minister of Foreign Affairs of the Republic of Bangladesh
Macky Sall, President of the Republic of Senegal
Ibrahim Mohamed Saleh, President of the Republic of Maldives
Uhuru Kenyatta, President of the Republic of Kenya
Dr Mohamed El Menfi, President of the Presidential Council of Libya
General Mohamed Hamdan Dagalo, Vice President of the Sovereignty Council of the Republic of Sudan
Dr Abiy Ahmed, Prime Minister of the Federal Democratic Republic of Ethiopia
Dr Philip Mpango, Vice President of Tanzania
Accepting leaders' tributes with Sheikh Mohamed on Sunday was Sheikh Saud bin Rashid Al Mualla, Ruler of Umm Al Quwain; Sheikh Hamdan bin Zayed, Ruler's Representative in Al Dhafra Region, Sheikh Tahnoun bin Mohammed, Abu Dhabi Ruler’s Representative in Al Ain Region, Sheikh Saif bin Mohammed and Suroor bin Mohammed.
Sheikh Hazza bin Zayed, Deputy Chairman of Abu Dhabi Executive Council; Sheikh Saeed bin Zayed, Abu Dhabi Ruler’s Representative; Sheikh Issa bin Zayed; Sheikh Nahyan bin Zayed, Chairman of the Board of Trustees of the Zayed Charitable and Humanitarian Foundation; Lt Gen Sheikh Saif bin Zayed, Deputy Prime Minister and Minister of the Interior; and Sheikh Tahnoun bin Zayed, National Security Adviser were also present.
Sheikh Mansour bin Zayed Al Nahyan, Deputy Prime Minister and Minister of Presidential Affairs; Sheikh Falah bin Zayed; Sheikh Hamed bin Zayed, Member of the Abu Dhabi Executive Council; Sheikh Theyab bin Zayed; and Sheikh Abdullah bin Zayed, Minister of Foreign Affairs and International Co-operation, were present.
Officials included Sheikh Omar bin Zayed, Deputy Chairman of the Board of Trustees of Zayed bin Sultan Al Nahyan Charitable and Humanitarian Foundation; Sheikh Khalid bin Zayed, Chairman of the Board of Zayed Higher Organisation for People of Determination; Dr Sheikh Sultan bin Khalifa, Adviser to the UAE President; Sheikh Mohammed bin Khalifa, Member of the Executive Council; Sheikh Khaled bin Mohamed bin Zayed, Member of Abu Dhabi Executive Council and Chairman of Abu Dhabi Executive Office; and a number of sheikhs.