Theoretical research on collapsing supernovae in Russia

The development of theoretical research on collapsing supernovae at the Keldysh Institute of Applied Mathematics and the Alikhanov Institute for Theoretical and Experimental Physics is discussed. This theme has been investigated for almost half a century, anticipating and following a very important event in the history of astrophysics: the observation of the flare of Supernova 1987A in the Large Magellanic Cloud on February 23, 1987.