Ukraine said Russian forces were ramping up their attacks and trying to gain more territory before Kyiv's army received more foreign military aid, including F-16 fighter jets.
The US has awarded $982 million in contracts to 49 defense and technology firms to develop systems for its current and future unmanned surface vehicles.
The US military said it destroyed two uncrewed surface vessels in the Red Sea belonging to Yemen's Houthis, as well as one drone and seven radars that allowed the rebels to target ships.
A Romanian "mercenary" and two Congolese soldiers were killed and a UN peacekeeper wounded in three separate incidents in eastern Democratic Republic of Congo, several sources said.
The Israeli army will implement a daily "tactical pause of military activity" in part of the southern Gaza Strip during daylight hours to facilitate the delivery of aid.
Nuclear-armed countries hiked spending on atomic weapons by a third in the past five years as they modernized stockpiles amid growing geopolitical tensions.