To Lord Hokage, Uchiha Akira,
Peers would be the correct term. While we have never met, I understand the burden of the office that you hold. As such, you should also understand the burden that I carry. As such, I'm afraid that I will be of little help to you in your quest to attack these pirates. I have heard of no such news from my own people about the ships that enter in to my land.
Is it possible that you are telling the truth? It's likely so, but that alone is not enough for me to take action and dispatch shinobi to search the numerous islands. Every ship in my land has hired men and women that are made to defend it. I'm afraid that finding warriors on a ship is far more commonplace in Kiri than anywhere else. That said, that does not mean that I am not sympathetic to your cause.
Perhaps you could arm me with information on what was taken? I have eyes and ears in the markets, both legal and the black market kind. If I get word on the types of items or supplies that were stolen, I'll be able to lead a better investigation and see if your claims are true. I'm afraid with the vague information you've presented it is not enough to act on. Until I can find more solid evidence, I'm afraid that this problem will remain your own.
Until you provide me this information, I would recommend that you dispatch some shinobi to protect these ships and see what you can do. After all, that is what shinobi are for are they not?
Sincerely,
Kagami Nise, Mizukage