I recently learned at least here in Germany it's not. Because larger trees are protected, you're generally not allowed to remove them even if they are close to another property. When they fall, it's considered force of nature and you won't be blamed. Unless, of course, the tree wasn't healthy in the first place and would be considered a danger.

How that works out in practice is basically you as the owner of the tree have to document it's healthy each year. Then, if it falls and you can prove it was healthy you're fine. Hopefully neighbors insurance pays. If you didn't document the health of the tree, your neighbor can press charges and you (or your insurance) have to pay.