France's President Emmanuel Macron delivers an address during a reception for members of the French community at the International French School (IFS) in Singapore. AFP
With international pressure mounting on Israel over its two-month blockade of Gaza, Macron said action was needed "in the next few hours and days".
He also asserted recognition of a Palestinian state with conditions was "not only a moral duty, but a political necessity".
If there was no response in line with the humanitarian situation in Gaza "in the coming hours and days... we will have to harden our collective position," Macron said on a visit to Singapore.
This meant dropping an assumption that human rights were being respected "and apply sanctions", the French leader said hours before addressing a defence summit in the city-state.
Macron is on a diplomatic tour in Southeast Asia which also saw him visit Vietnam and Indonesia earlier this week.
While in Jakarta, Macron and Indonesian President Prabowo Subianto issued a joint statement condemning Israeli plans to take control of Gaza and any moves to "forcibly remove the Palestinian population from their homeland".
Macron said Paris hoped to "trigger a movement of recognition for a Palestinian state under certain conditions", including the demilitarization of Hamas and what he described as Israel's right to exist and protect itself.
Israel's genocidal war on Gaza, now in its nineteenth month, has killed or injured more than 177,000 Palestinians, according to Gaza health officials. Thousands remain trapped beneath the rubble. Israel’s blockade and bombardment have collapsed Gaza’s infrastructure, blocked aid, and triggered famine.
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