International mediators trying to promote Mideast peace warned in a highly anticipated report Friday that Israel’s settlement expansion is eroding the viability of a Palestinian state and raises “legitimate questions” about its commitment to a two-state solution. The Quartet of Mideast negotiators — the U.N., U.S., European Union and Russia — also criticized the glorification of Palestinians who commit “terrorist attacks” against Israel and called on the Palestinian Authority to “act decisively” to stop incitement to violence and clearly condemn “all acts of terrorism.” While the Israeli and Palestinian leaders and the majority of people on both sides support a...