Translation guide
The National Security Council is a specific government body. In Japanese, it is referred to by its official name or translated descriptively depending on the country.
Referring to the United States National Security Council
Standard Japanese translation for the U.S. National Security Council. Often abbreviated as NSC.
国家安全保障会議（NSC）が会合を開いた。
The National Security Council (NSC) held a meeting.
The English abbreviation is widely understood in Japanese news and political contexts.
NSCの役割は重要だ。
The role of the NSC is important.
Referring to Japan's own National Security Council, established in 2013
The official Japanese name for Japan's NSC. Same translation as the U.S. body, but context distinguishes them.
日本の国家安全保障会議は2013年に設置された。
Japan's National Security Council was established in 2013.
Often called 'Japan's version of the NSC' in media to distinguish it from the U.S. one.
日本版NSCの初会合が開かれた。
The first meeting of Japan's NSC was held.
Referring to similar bodies in other nations
General pattern: country name + の + 国家安全保障会議. For example, イギリスの国家安全保障会議 for the UK NSC.
インドの国家安全保障会議が声明を発表した。
India's National Security Council issued a statement.