The fact is that Special Advisor Kishi never made such a post.
The Government of Japan has already lodged a protest with the Russian Embassy in the UK, and the Embassy has deleted the post from its SNS account that cited the said fake post.
Recently, the SNS account of the Russian Embassy in the UK retweeted a fabricated post, which pretended that KISHI Nobuo, Special Advisor to the Prime Minister, had posted on Twitter that the Ukrainian military had launched a missile attack on the Zaporizhya nuclear power plant.