The individual, identified in court papers only as OCG, was returned on a commercial flight on Wednesday, according to his lawyers.
On Wednesday, the agency which orchestrated the attack, the Security Service of Ukraine (SBU), released additional, vivid footage of the attacks in progress, as well as tantalising glimpses into how the whole complex operation was conducted.Satellite images that have emerged since Sunday, showing the wrecked outlines of planes sitting on the tarmac at the Olenya, Ivanovo, Dyagilevo and Belaya airbases, also help tell the story of the operation's unprecedented success.
For Ukrainian observers, the whole operation, a year-and-a-half in the making, remains a marvel."This can be considered one of the most brilliant operations in our history," Roman Pohorlyi, founder of the DeepState, a group of Ukrainian military analysts, told me."We've shown that we can be strong, we can be creative and we can destroy our enemies no matter how far away they are."
It's important to note that almost all the information that has emerged since Sunday has been released by the SBU itself.Flushed with its own success, it is keen to cast the operation in the best possible light. Its information campaign has been helped by the fact that the Kremlin has said almost nothing.
Speaking to the media on Wednesday after handing out medals to SBU officers involved in the operation, the Ukrainian president, Volodymyr Zelensky repeated the claim that 41 aircraft had been damaged or destroyed.
"Half of them cannot be restored," he said, "and some will take years to repair, if they can be restored at all."Marks and Spencer (M&S) and the Co-op had their operations severely disrupted when they were targeted in April.
The UK's National Crime Agency has said catching the criminals responsible isthe hackers it was targeted by used a technique called "credential stuffing", where attackers try usernames and passwords stolen from another data breach, in the hope customers have reused the same passwords across multiple accounts.
They say the attackers may have been able to gain access to some users' shipping addresses and purchase histories.Affected customers will need to change their passwords.