If Nasrallah has evidence linking Israel to the Hariri case, let him present it to the UN investigators. Nasrallah's claims that Israel tried some 10 years before Hariri's assassination to drive a wedge between him and Hizballah indicates nothing about the assassination. It is difficult to see what motive Israel would have to remove Hariri, a strong man who could stand up to the Shiites. For this very same reason, Hizballah had a motive to eliminate Hariri. Perhaps Hariri the Son managed to find out where Mughnieh, the top Hizballah military commander, was located, "leaked" it to Israel, and exacted his revenge this way. Now that Hariri was avenged, the Son is willing to make nice with Hizballah.
Israeli PM to Palestinian President Abbas: We must fight terror together (Haaretz)
from the article: Lebanon PM: UN must probe claims of Israeli complicity in Hariri murder