Saudi Arabia's air defences intercepted two ballistic missiles over the capital Riyadh on Wednesday, state television said, the latest in a series of attacks claimed by rebels in neighbouring Yemen.

France's foreign minister accused Iran on Monday of not respecting part of a UN resolution that calls on Tehran to refrain from work on ballistic missiles designed to carry nuclear warheads.

France's foreign minister accused Iran on Monday of not respecting part of a UN resolution that calls on Tehran to refrain from work on ballistic missiles designed to carry nuclear warheads.

This "could be considered as an act of war," Saudi Crown Prince Mohammed bin Salman said.

North Korea's missile development poses a "new level of threat", Japan's defence ministry said Tuesday in an annual report that also reiterated concerns over China's increasing military posture.

North Korea fired four ballistic missiles into the sea off Japan's northwest on Monday, angering South Korea and Japan, days after it promised retaliation over US-South Korea military drills it sees as a preparation for war.

US Republican senators plan to introduce legislation to impose further sanction on Iran, accusing it of violating UN Security Council resolutions by testing ballistic missiles and acting to "destabilise" the Middle East, a US senator said Sunday.

North Korea fired three ballistic missiles off its east coast on Monday in a defiant reminder of the risks to global security, as world leaders including US President Barack Obama gathered at a G20 summit in China for the second day.

The UN Security Council hastily met for closed-door talks on North Korea's failed test-firing of ballistic missiles, the latest defiance from Pyongyang of UN resolutions.

Iran's Islamic Revolutionary Guards Corps (IRGC) test-fired two ballistic missiles on Wednesday morning that it said were designed to be able to hit Israel, defying a threat of new sanctions from the United States.