Israel has promised to retaliate for Iran’s massive missile attack last week. How it does so involves great risk, and could have major repercussions for the archenemies, the Middle East and the world. Israel's options range from symbolic strikes on military targets to crippling attacks on Iran's vital oil industry or its secretive and heavily fortified nuclear program. The intensity and timing of any retaliatory strike was expected to top the agenda of a planned meeting this week at the Pentagon between Israel’s defence minister and his U.S. counterpart.