As the reported execution of the uncle of North Korean leader Kim Jong Un stirs speculation about the stability of the hermit regime, one Japanese celebrity politician says he plans to embark on a trip there, despite being punished for going last month in breach of parliamentary rules.

Speaking on television Sunday, professional wrestler-turned upper-house lawmaker Antonio Inoki said he planned to make his 28th excursion to Pyongyang before the next Diet session convenes in late January. His secretary confirmed Monday that...