Japan has a lot riding on Brexit. That's something Shinzo Abe is sure to drill home to Theresa May when he flies over to see her in person mere days before Parliament is poised to vote on her divorce plan.

Few countries are as worried about the prospect of a disorderly exit, given the degree of foreign investment in the U.K., from carmakers Nissan Motor Co. to tech conglomerate SoftBank Group Corp. and fashion brand Uniqlo.

For them, the U.K. is their foothold in Europe and her deal may be the only thing guarding them from the chaos of a no-deal outcome. That is why Abe will probably speak out in favor of May's proposal, according to a Foreign Ministry official.