Sheikh Mohammed bin Zayed, Crown Prince of Abu Dhabi and Deputy Supreme Commander of the Armed Forces, will visit Moscow on Thursday to meet Russian president Vladimir Putin.
US secretary of state John Kerry is also expected to meet Mr Putin on Thursday and press him for Russia’s view of a future political transition in Syria and the fate of president Bashar Al Assad.
With a fragile truce in place in Syria and warring sides attending peace talks in Geneva, Mr Kerry wants to “get down to brass tacks” on the question of Mr Al Assad’s future, a US State Department official said.
While the United States want Mr Al Assad to step aside, Russia says only the Syrian people can decide his fate at the ballot box and has bristled at any talk of regime change.
Mr Kerry’s talks with Mr Putin at the Kremlin were arranged after the Russian leader’s surprise announcement on March 14 that he was partially withdrawing his forces from Syria.
“The secretary would like to now really hear where president Putin is in his thinking ... on a political transition” in Syria, the official said as Mr Kerry arrived in Moscow.
“Obviously what we are looking for, and what we have been looking for, is how we are going to transition Syria away from Assad’s leadership,” the official said, speaking on condition of anonymity.
After five years of conflict that has killed more than 250,000 people and caused the world’s worst refugee crisis, Washington and Moscow reached a deal three weeks ago for a cessation of hostilities and delivery of humanitarian aid to besieged areas.
The State Department official said meetings with Mr Putin and Mr Lavrov would evaluate the status of the ceasefire and try to “get on the same page” about ending violations and increasing humanitarian assistance.
Russia this week threatened to act unilaterally against those who violate the ceasefire unless it reached a deal with the United States on ways to detect and prevent truce breaches.
The Syrian opposition has accused government forces of renewing sieges and stepping up a campaign of barrel-bombing across the country.
In Geneva, where warring sides are a week into talks on ending the conflict, government officials have rejected any discussion on the fate of Mr Al Assad, who opposition leaders say must go as part of any transition.
*Reuters with The National staff