You needn't wait for Hezbollah soldiers, armed to the teeth, (courtesy of Iran), to rise out of them before counter-attacking.
Nasrallah is the leader of Hezbollah (and therefore Lebanon), so how is it that he is not being charged with trying to start a war? The UN must remove him. What is the UN doing about this? The same thing they did while these tunnels were being dug over the last few years: nothing.
Could the UN force, trained to look for Hezbollah activity, really miss all this digging and disposal of dirt and rock? More likely the UN willfully turned a 'blind eye' to it. That makes the UN an accomplice.