Hi RedFury43, you will be able to declare war when the invasion is over. You will not lose your influence and the territory will still be in conflict. We are going to see how we can improve legibility of that screen. It also looks like there is a bug where the invasion is not correctly reported in the tab but it looks like a UI issue. I will relay that information to the team, thanks for reporting it. Let me know if you have any issues with declaring war after the invasion is over.