Israel is racking up military wins against its regional foes. But fighting multiple wars will take its toll, and experts wonder what the long-term strategy is.

Hezbollah has announced ongoing clashes with Israeli forces along Lebanon's southern border, coinciding with Israeli airstrikes targeting Hezbollah strongholds, including a mosque. The violence has escalated into full-scale conflict,

Israel said early on Sunday it had carried out "a series of targeted strikes" on southern suburbs close to the Lebanese capital.

Palestinian officials say an Israeli strike on a mosque in the Gaza Strip has killed at least 19 people. Israel meanwhile intensified its bombardment of northern Gaza and southern Beirut on Sunday in its widening war on Iran-allied militant groups across the region.

Israeli claims that its soldiers began ground operations inside southern Lebanon "are false," Hezbollah said in a Tuesday statement. "No direct ground clashes have yet taken place between the resistance fighters and the occupation forces," the group said, referring to Israeli troops.