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Klyuchevskoy  Volcano  is  one  of  the  most  active  volcanoes  in  the  world.  In  2019–2021,  there  were  two  summit  explosive-effusive  volcanic  eruptions  with  an  interval  of  88  days.  On  February  17,  2021,  9    days  after  the  end  of  the  second  summit  eruption,  at  an  altitude  of  2.8  km  a.  s.    l.  a  lateral  eruption  appeared on the northwestern slope of the volcano. Its discovery was due to continuous monitoring of the volcano using satellite data of low, medium and high resolution available in the information system “Remote monitoring of the activity of the volcanoes of the Kamchatka and the Kuriles” (VolSatView, http://kamchatka.volcanoes.smislab.ru). The thermal anomaly in the area of the lateral break was de-tected  using  medium-resolution  satellite  images,  the  eruption  was  confirmed  using  high-resolution  ima ges, the dynamics of the break development — using low-resolution images (Himawari-8). Two fis-sures  formed  on  the  volcanic  flank,  from  which  lava  flows  effuse.  By  21–22  February,  lava  flows  be-gan  to  intrude  into  the  Erman  glacier.  Mud  flows  from  the  fronts  of  lava  flows  along  the  Krutenkaya  River passed 7 km from the Klyuchi Village in the direction of the Kamchatka River. By 28 February, the  lower  fissure  stopped  working,  but  the  eruption  of  the  lateral  break  is  actively  continuing:  the cinder  cone  is  growing;  the  area  of  the  lava  field  is  increasing.  The  2021  lateral  break  is  named  after  Corresponding Member of the USSR Academy of Sciences G. S. Gorshkov