SINGAPORE, Sept. 23 -- Singapore will continue to back a negotiated two-state solution as the "only path to a durable peace" between Israelis and Palestinians, Prime Minister Lawrence Wong said, while warning that the city-state could tighten its stance if violence escalates.

In a Facebook post yesterday, Wong stressed that Singapore has "long supported" the Palestinian people's right to a homeland but insisted there is "no other alternative" to a settlement achieved through negotiations.

"Regrettably, extremist elements on both sides are undermining prospects for a two-state solution," he wrote.

Wong announced that Singapore will impose targeted sanctions on leaders of radical settler groups accused of violence against Palestinians in...