A long-awaited exchange of prisoners being held by Russia and Ukraine appears to be under way.
Buses from a Russian jail headed towards a Moscow airport “within the framework of preparations”, Russian TV said, and planes flew to Kiev and Moscow.
Those expected to be swapped include 24 Ukrainian sailors – and Volodymyr Tsemakh, a “person of interest” in the investigation into the 2014 shooting down of a Malaysian Airlines plane.
The swap is aimed at easing tensions.
Relations between the two neighbours deteriorated dramatically in 2014, when Russia annexed Ukraine’s Crimean peninsula and Russian-backed rebels began an insurgency in two regions of eastern Ukraine.
More than 13,000 people have been killed in the conflict in Donetsk and Luhansk regions.
In April Ukrainians elected a new president. Volodymyr Zelensky said his top priority was to end the conflict.
Russian officials have said progress towards a prisoner release is vital for improving the “atmosphere surrounding a settlement of the Ukrainian crisis”.
Negotiations on the extremely sensitive issue were held in complete secrecy, with both Ukrainian and Russian officials stressing that any leaks could derail the swap.
On 30 August, Ukraine’s new prosecutor shared a Facebook post suggesting a swap had begun. This was later denied by President Zelensky’s office.
Who is being exchanged?
Thirty-five prisoners in total are thought to be included by each side.
Russia’s list is dominated by 24 Ukrainian sailors it detained off Crimea in November last year.
They were captured along with three naval ships as they attempted to pass through the Kerch Strait, the only access to Ukrainian ports on the Sea of Azov. Shots were fired by the Russian navy during the operation, injuring several Ukrainians.
In May an international tribunal ordered Russia to release the sailors and vessels.
The other 11 people being swapped include Ukrainian film-maker Oleg Sentsov, jailed for 20 years in 2015 for plotting terrorist acts in Crimea in a trial condemned as political by the US and EU. He is considered Ukraine’s number one political prisoner in Russia.
Also on the list are two far-right Ukrainian activists, Mykola Karpyuk and Stanislav Klykh, both arrested in Russia in 2014. They were accused of fighting on the side of Chechen rebels in the first Chechen war in the 1990s and were later jailed.
The most significant and controversial figure on Ukraine’s list is Volodymyr Tsemakh, reportedly a commander of air defences for Russian-backed rebels in eastern Ukraine.
Others included are Yevgeny Mefedov and Pavel Dolzhenkov, jailed over deadly clashes between pro-Russian groups and Ukrainian nationalists in the Black Sea port of Odessa in 2014.
Two former Ukrainian army soldiers who Ukraine says defected to Russia during the annexation of Crimea, Maksim Odintsov and Aleksandr Baranov, are also on the list.
Why is Mr Tsemakh’s inclusion on the list controversial?
Mr Tsemakh, 58, is a “person of interest” in the Dutch-led investigation into the 2014 shooting down of Malaysian Airlines Flight MH17, which led to the deaths of all 298 people on board.
He is believed to have been a commander of air defences at Snizhne in the self-proclaimed Donetsk People’s Republic, one of the Russian-backed rebel areas in eastern Ukraine.
Snizhne is close to where investigators say the missile which shot down the plane was fired.
A team of international criminal investigators said in 2016 that the missile had been brought from Russia and fired from a field controlled by Russian-backed separatists.
In a daring operation in June, Ukrainian special forces reportedly smuggled Mr Tsemakh out of rebel-held territory, and he had been due to stand trial in October.
Although he is not a suspect, international prosecutors have said they would like him to remain in Ukraine so they can ask him further questions.
Last week, they urged the authorities in Ukraine not to allow him to travel to Russia.
However, in a court decision on Wednesday he was released from custody.