Former US President Barack Obama said some of Israel's actions in its war against Hamas, like cutting off food and water for Gaza, could weaken international support and "harden Palestinian attitudes for generations".
In rare comments on a foreign policy crisis, Obama said any Israeli military strategy that ignores the human costs of the war "could ultimately backfire".
"The Israeli government's decision to cut off food, water and electricity to a captive civilian population (in Gaza) threatens not only to worsen a growing humanitarian crisis; it could further harden Palestinian attitudes for generations, erode global support for Israel, play into the hands of Israel's enemies, and undermine long-term efforts to achieve peace and stability in the region," Obama said.
Israel has launched intensive air strikes on Gaza since the Hamas attack on Israel on October 7 killed more than 1,400 people. Gaza officials say Israeli air strikes have killed more than 5,000 Palestinians.
He denounced the Hamas attack and reiterated his support for Israel's right to defend itself, but at the same time, he warned of the dangers to which civilians are exposed in such wars.
Iran said on Sunday it had received a US response to its latest offer for peace talks, a day after President Donald Trump said he would probably reject the Iranian proposal because "they have not paid a big enough price".
The Israeli military issued an urgent warning on Sunday to residents of 11 towns and villages in southern Lebanon, urging them to evacuate their homes and move at least 1,000 metres (3,300 feet) away to open areas.
Ukrainian drones attacked Russia's Baltic Sea port of Primorsk on Sunday, temporarily setting it on fire, local governor Alexander Drozdenko said on the Telegram messaging app, as Kyiv launched a wave of strikes on targets across the country.
An Israeli court has extended by two days the detention of two activists arrested aboard a Gaza-bound flotilla that was intercepted by Israeli forces in international waters near Greece, their lawyer said on Sunday.
Heavy rains that hit northeastern Brazil over the last 48 hours have killed at least six people and displaced thousands in the states of Pernambuco and Paraiba, the federal government said in a statement on Saturday.