While Kyiv remains defiant, Stoltenberg warns Western countries must be ready to offer continued help in grinding war; Zelensky admits losses are 'significant'

Delivery will be largest since invasion began; US president also promises $225 million in humanitarian aid

Stoltenberg says alliance faces 'war of attrition' in Ukraine; reiterates NATO uninterested in confrontation with Russia but has 'responsibility' to back Ukraine

Jens Stoltenberg welcomes membership requests by two countries neighboring Russia at 'crucial moment for our security'

Diplomats meeting in Berlin to discuss new potential members and increasing Ukraine aid; Finland and Sweden already making moves toward joining

Energoatom claims soldiers retreated after 'becoming sick' in highly radiated area; adds that Moscow signed off on document handing over control of the power pant

Addressing alliance, Ukrainian leader accuses Russia of using phosphorus bombs; children among dead in strikes near Luhansk; Ukraine says it hit Russian naval transport vessel

Jens Stoltenberg says Russian chemical weapons use 'would fundamentally change the nature of the conflict' but doesn't specify if NATO will respond; Zelensky to press for more arms

Alliance's chief says Moscow would have 'a high price to pay' if it uses chemical weapons, refuses to 'speculate about any any military response from the NATO side'

NATO chief Jens Stoltenberg warns that Russia 'could plan chemical weapons operations' after spreading baseless accusations that Ukraine is developing biological warfare