Chief Cabinet Secretary Yoshihide Suga on Tuesday said Japan may cut its financial contribution to an agency of the United Nations after the organization added documents on the Nanjing Massacre to its International Memory of the World Register last week.

According to the United Nations Educational, Scientific and Cultural Organization website, documents about the Nanjing Massacre, submitted by the Chinese government, were added this year under the program, which aims to preserve and offer universal access to the world’s documentary heritage.