without recognizing Japan does not recognize same-sex marriage in its Constitution

The following is from a tweet by Nobuo Ikeda, which I just discovered.
Nobuo Ikeda
@ikedanob
You are totally mistaken.
They assume that "Japan is a backward country in human rights" without recognizing the fact that Japan does not recognize same-sex marriage in its Constitution.

U.S. Ambassador to Japan Emanuel stressed to this newspaper that same-sex marriage "should be legalized as soon as possible" and that "a society that excludes people cannot build a future": Tokyo Shimbun TOKYO Web