Our alliance leader somewhat quit the game and is not playing anymore, how can we have a new leader?

Yep. I am the alliance leader of WOE and I have to be careful to log in every 7 days

Yes, that happened to me and the system automatically made me leader since I was the next highest power active player. I didn't want to be leader, so I was able to transfer leadership to the next highest player and leave the alliance. Once leader, system doesn't allow the leader to just leave. Either disband alliance or do as I did.

You are Leaders and can easily transform the leadership. The question asks what if the R4 officers have left without leadership. In my case the leader is active in far far away distance, never replies to our messages for weeks and we stay active but leaderless. Is there any way to solve this?

If your leader is active, but don't contribute or care for the alliance, all you can do is to leave him, and create a new one