He said this on the air of the Polish Radio, commenting on Melnik's statements about Stepan Bandera.
According to Blashak, Melnik's statements are inadmissible and unacceptable.
“It is interesting how much he has become a useful idiot of the Kremlin,” the Polish minister said.
Earlier, the Israeli Embassy in Berlin sharply criticized the statement of the Ukrainian Ambassador to Germany about Bandera.
According to Sputnik radio, Melnik earlier in an interview with the journalist of the German edition Tilo Jung called the Nazi accomplice Stepan Bandera a "freedom fighter" and Robin Hood.