I don't know how many meters Israel has to work with on the other side of the fence, but the pictures seem to show Israeli soldiers more than just a few meters past the fence. But it looks like Lebanon might be enforcing their border the same way Israel enforces the Gaza border. Israel set the precedent, and they don't like it when it is done to them. Typical. I would say that if Israel wants to trim trees, they should do so ONLY with the UNIFIL forces monitoring exactly how far they cross beyond the fence. Otherwise, follow your own precedent in Gaza, and keep a nice safe distance from the fence.
IDF reservist, 44, dies of heart attack during training (Haaretz)
from the article: Israeli officer killed in clash on Israel-Lebanon border