As fighting in Gaza continues, concerns remain that there may be a major escalation of fighting between Israel and Iran-backed Hezbollah in Lebanon (Yahoo, Al Arabiya, ABC News). For the purposes of this question, the IDF will be deemed to have invaded Lebanon if its forces, including ten or more tanks and/or armored vehicles, cross the "Blue Line" into Lebanon and remain in Lebanon for more than 36 hours (UN Interim Force in Lebanon, Britannica - Armoured Vehicle). Whether the IDF has invaded Lebanon will be determined using credible open-source media reporting. The question will close retroactively as of the beginning of the IDF invasion of Lebanon.

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