In this May 24, 2015 photo, Hezbollah fighters stand guard during a rally commemorating "Liberation Day," which marks the withdrawal of the Israeli army from southern Lebanon in 2000, in the southern town of Nabatiyeh, Lebanon. Hundreds of Iranian troops are being deployed in northern and central Syria, dramatically escalating Tehran’s involvement in the civil war as they join allied Hezbollah fighters in an ambitious offensive to wrest key areas from rebels amid Russian airstrikes. (AP Photo/Mohammed Zaatari, File)
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