By Oren Liebermann, Haley Britzky, Phil Mattingly and Brad Lendon, CNN (CNN) — The US and Japan are set to announce a significant strengthening of their military relationship and upgrading of the US military's force posture in the country this week, including the stationing of a newly redesignated Marine unit with advanced intelligence, surveillance capabilities and the ability to fire anti-ship missiles, according to two US officials briefed on the matter. The announcement sends a strong signal to China and will come as part of a series of initiatives designed to underscore a rapid acceleration of security and intelligence ties…