1938-1939 In Moscow ,particapates in the Ten-days Festival of Armenian Culture.
1956 During the days of the Second Ten-day Festival of Armenian Art and Literature in Moscow particpates in the exhibition of Armenian fine arts.
1965 After a thirty-year break the one-man show of Kotchar opens in Fatherland, in Yerevan.
1966 The one-man show, ” Kotchar et la peinture dans l`espace”, opened at the “Percier” Gallery.
1970 Particpates in the exhibition , “Armenian Culture from Urartu up to the Present Day”, opened in Louvre.
1971 His second one-man show opens in Yerevan.
1973 An one-man show opens in the Museum of Eastern Peoples in Moscow .
1974 Tretyakov gallery and the Russian Museum obtain paintings and drawings.
One-man shows open in Baku and Tbilisi.
1976-1977 Particpates in the exhibition, ” Self-portrait in Russian and Soviet Art in 1930-1950″(Moscow, Soviet Union cities, Bularia ,Poland and Hungary).
1978 An one-man show of Kotchar’s graphic works open in Yerevan.