Poland pulled out of a meeting of four central European countries in Israel on Monday after falling out with the Israeli government over Polish collaboration during the Holocaust.
Polish Prime Minister Mateusz Morawiecki cited "racist" comments by acting Israeli Foreign Minister Israel Katz for the decision.
"The words of the Israeli foreign minister are racist and unacceptable," he said. "It is clear that our foreign minister (Jacek) Czaputowicz will not be travelling to the summit."
Katz told Israeli television over the weekend that Poles had "collaborated with the Nazis" and "sucked anti-Semitism from their mothers' milk."
The Polish Foreign Ministry said it had summoned Israel's ambassador to Poland, Anna Azari, in response.
Poland's withdrawal from the two-day meeting of the Visegrad Group, an association that also includes the Czech Republic, Hungary and Slovakia, came a day after Morawiecki said he was cancelling his attendance.