President Biden's National Security Advisor, Jake Sullivan, says the United States expects Israel's war in Gaza to enter a new phase, focused on precise targeting of Hamas leaders.

Washington has strongly backed Israel's right to defend itself following the Hamas attacks in October, but mounting civilian casualties have caused growing tension between the close allies.

Also in the programme: we'll hear reaction from the frontline in Ukraine after a hold-up in military aid from both the European Union and the US; and a new train network in Mexico may be good news for tourists - but what's the environmental cost?

(Photo shows U.S. National Security Advisor Jake Sullivan speaking during a press briefing in Tel Aviv, Israel on 15 December 2023. Credit: Violeta Santos Moura/Reuters)