Has Japanese etiquette gone too far?
8 November 2013 Last updated at 13:29 GMT
A member of the Japanese parliament has been reprimanded for attempting to involve the emperor in politics.
Taro Yamamoto is to be barred from future events at the Imperial Palace after handing a letter to Emperor Akihito about the impact of the Fukushima nuclear disaster.
Japanese businessman Seijiro Takeshita from Mizuho International in London said the protest had "definitely crossed the line".