Israel carried out a wave of heavy airstrikes across Syria as its troops advanced deeper into the country, a Syrian opposition war monitor said. Israeli Prime Minister Benjamin Netanyahu is on trial for corruption.

Israeli warplanes pounded military sites in Syria after Israeli troops seized a border buffer zone following the collapse of President Bashar Assad’s rule. Israel denied its forces were advancing toward Damascus.

Egypt, Jordan and Saudi Arabia have condemned Israel’s incursion, accusing it of exploiting the disarray in Syria following the overthrow of President Bashar Assad and violating international law. The buffer zone was established after the 1973 Mideast war.

Meanwhile, Israeli Prime Minister Benjamin Netanyahu testified in his long-running trial for alleged corruption. The testimony is another low point for Israel’s longest-serving leader, who also faces an international arrest warrant for alleged war crimes in Israel’s war in Gaza.