U said "Why on earth did the IDF want to cut down a tree inside Lebanon?" Easy answer....IDF did it just to provoke a reaction from Lebanon Army in order to retaliate afterward. It's the usual old "game" played by IDF.
Clinton: U.S. must "make clear" to Putin that Russia cannot be creating chaos in Syria (Reuters)
from the article: 3 Lebanese soldiers, journalist killed in clash on Israel-Lebanon border