Bahrain's King Hamad was welcomed to the UAE by Sheikh Mohamed bin Zayed on Tuesday.
The monarch arrived at the Presidential Airport, in Abu Dhabi, for the start of his latest visit to the Emirates.
Sheikh Mohamed and King Hamad will be joined on Wednesday by King Abdulla II of Jordan, for a tripartite summit in Abu Dhabi.
The Prime Minister of Greece also landed in the capital for the start of a two-day working visit.
Kyriakos Mitsotakis was greeted by Dr Sultan Al Jaber, Ministry of Industry and Advanced Technology, and a number of senior officials, at the Presidential Airport in Abu Dhabi.