  A minor population of antistars in galaxies has been predicted by some of
non-standard models of baryogenesis and nucleosynthesis in the early Universe,
and their presence is not yet excluded by the currently available observations.
Detection of an unusually high abundance of antinuclei in cosmic rays can probe
the baryogenesis scenarios in the early Universe. Recent report of the
\textit{AMS-02} collaboration on the tentative detection of a few antihelium
nuclei in GeV cosmic rays provided a great hope on the progress in this issue.
We discuss possible sources of antinuclei in cosmic rays from antistars which
are predicted in a modified Affleck-Dine baryogenesis scenario by Dolgov and
Silk (1993). The model allows us to estimate the expected fluxes and isotopic
content of antinuclei in the GeV cosmic rays produced in scenarios involving
antistars. We show that the flux of antihelium CRs reported by the
\textit{AMS-02} experiment can be explained by Galactic anti-nova outbursts,
thermonuclear anti-SN Ia explosions, a collection of flaring antistars or an
extragalactic source with abundances not violating existing gamma-ray and
microlensing constraints on the antistar population.
