RFS Nikolay Chiker towing the 55,000 ton Admiral Kuznetsov in rough seas (~2012)

Russian Navy ensign

While I haven't found the exact date of this operation, my understanding is it was in 2012 when the Admiral Kuznetsov (Адмира́л Кузнецо́в or Адмира́л фло́та Сове́тского Сою́за Кузнецо́в) experienced engine trouble and had to be towed by the RFS Nikolay Chiker (Николай Чикер), one of the most powerful tugs in the world, and specifically built for just such a task.  This is exactly why the Russian Navy often deploys an ocean going tug in their flotillas.

Wikipedia:
https://en.wikipedia.org/wiki/Russian_aircraft_carrier_Admiral_Kuznetsov