  This work considers $K^0, \bar K^0$ meson mixings and oscillations via
$K^0_1, K^0_2$ meson states at strangeness violation by weak interactions in
two cases - without and with taking into account $K^0_1, K^0_2$ meson decays.
In the first case the oscillation theory correctly describes $K^o, \bar K^o \to
K^o, \bar K^o$ transition processes. In the second case, when we take into
account meson decays, the oscillation theory cannot correctly describe this
process at long distances since mainly $K^o_2$ mesons remain at long distances
therefore the condition for oscillations is absent. So, at long distances in
this process only long living $K^0_2$ mesons are present but not $K^o, \bar
K^o$ mesons.
