Extraordinary video images have emerged of a Tupolev Tu-154 apparently suffering serious in-flight oscillations shortly after departing from an air base in Moscow.
Text accompanying the images indicates that the aircraft - whose registration is given as RA-85563 - was flying from the Moscow Chkalovsky base on 29 April.
Details of the incident remain sketchy and unconfirmed but a series of video clips shows the aircraft departing, before it appears to encounter problems in lateral and longitudinal control.
It eventually returns to the airfield to land. Unconfirmed reports suggest the aircraft was conducting a maiden flight after long-term storage.