The Yemeni group says it carried out attacks that killed 13 people over the weekend and targeted two airports and oil facilities.

The Houthis have stepped up their attacks on Saudi Arabian soil, and while the physical damage can be quickly repaired, its reputation for stability is taking a battering.

The PM was speaking after violent attacks at Polish schools this week left one dead and others injured.

Neither Kyiv nor Moscow have yet commented on the US president's assertion of an immediate truce.