France's Emmanuel Macron has discussed increased pressure and sanctions on North Korea on the telephone with US President Donald Trump and Japan's Prime Minister Shinzo Abe, the French president's office says.
The three leaders stressed the need for a "united and firm" reaction from the international community towards Pyongyang, Macron's office said on Saturday.
South Korea was bracing on Saturday for a possible further missile test by North Korea as it marked its founding anniversary, just days after its sixth and largest nuclear test.
The French presidency said North Korea's "repeated provocations" were a "threat to peace and international security". It also said Mr Macron had expressed France's "solidarity" with Japan.
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Tension on the Korean peninsula has escalated as North Korea's leader, Kim Jong-un, has stepped up the development of weapons, testing a string of missiles this year, including one flying over Japan.
Experts believe the Pyongyang government is close to its goal of developing a powerful nuclear weapon capable of reaching the US, something Trump has vowed to prevent.