The only true deterrent is not a first strike capability, such as Israel is focused on, but a second strike ability coupled with a credible missile shield. The enemy will certainly hesitate, no matter how suicidal and fanatical, if attacking Israel meant as a certainty that every major Arab capitol and Iranian city plus Mecca would not only be blasted but irradiated to the point of being uninhabitable for 500 years. Simply put, Israel must make a heavy investment in a nuclear-armed submarine fleet. with MIRVed missiles.
Austrian chancellor: Austria and Germany will allow migrants entry (Reuters)
from the article: What it means if the button is pushed