Whether we like it or not Israel helped Iran during the Iran-Iraq war by selling arms to Iran when everyone was helping Iraq. Destroying Iraq's nuclear reactor ensured that Iraq could not use nukes against Iran. Israel also helped Hamas develop as a counter to Fatah and the PA.
Man shot dead in northern Israel town of Bi'ina, police say the murder was gang related (Haaretz)
from the article: Assad's fall could deliver Lebanon to Iran and Hezbollah