The top leaders of Japan's ruling Liberal Democratic Party (LDP) have all announced their intentions to step down. Though the reasons remain undisclosed, the resignations are thought to be linked to recent political events and changes within the party. The time scales for these resignations and their potential replacements have not yet been addressed officially.

The LDP is the ruling party of Japan and has had a strong influence on the country's policies and legislation for years. Such a mass resignation of its top brass signifies a big shakeup in Japanese politics. The public will be paying close attention to how this will affect the political landscape, and consequently, the country’s policies and international relations.

In the US or EU, a mass resignation of a ruling party's leadership would also signify a significant reorganization of the party's structure and future directions. However, the process and implications may differ depending on the specific political systems and circumstances.