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There were emotional scenes as the families of missing Ukrainian soldiers gathered near the border with Belarus to press the returning prisoners for information about their loved ones.

As with past exchanges, Moscow said the exchanged Russian soldiers were receiving psychological and medical assistance in Belarus.

This is Scotland's final game before they start World Cup qualification in September, with Denmark, Belarus, and Greece making up their group.

Scotland now have a cluster of players good enough to compete in a qualifying group containing Denmark, Greece and Belarus.

Gen Breuer singled out the so-called Suwalki Gap, an area that borders Lithuania, Poland, Russia and Belarus, as one of the most vulnerable.