The Israel–Iran conflict is a tense standoff that has lasted for decades between two Middle Eastern countries with deeply opposing political and religious positions. The animosity dates back to after the Iranian Revolution in 1979, when Iran declared it would not recognize the existence of the State of Israel and supported anti-Israel organizations such as Hezbollah (in Lebanon) and Hamas (in the Gaza Strip). Meanwhile, Israel sees Iran as the greatest threat to national security, particularly concerning Tehran's nuclear program.