Police have been searching for him ever since with specialist officers brought in to help.
He is described as being 6ft 2ins tall, of slim build and with short brown hair. He was wearing a beige jumper and black jeans the last time he was seen and had a yellow beanie hat with him.
Police are now urging anyone with information or dash-cam footage to come forward as they continue to identify his movements.
Inspector David Hall said: “We are extremely concerned for Aleksandr, especially given the cold weather conditions lately.
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“Since Aleksandr was reported missing almost one week ago, we have been carrying out extensive searches and enquiries in and around the Stornoway area. Officers, led by specialist search advisors, have been assisted by police dogs and a police mountain rescue team.
“Our partner agencies are also helping with searches. Despite these efforts and previous appeals, we have yet to trace him. His family and friends are extremely upset and concerned by his disappearance.
“We have reviewed CCTV and footage provided by the public, however we have been unable to establish the exact route he travelled after leaving the water wheel on the morning of Monday, 18 November.”
“To help us establish this, we would ask any drivers with dashcams who were either travelling on the A859 between Willowglen Road, Stornoway and Cameron Terrace, Lochs or on Pentland Road between 8.45am and 12pm on Monday, 18 November, to please contact us.”
If you have any information on Aleksandr’s whereabouts, contact Police Scotland via 101 as soon as possible, quoting incident 0803 of 18 November, 2024.Â