Speaking after meeting European leaders in Paris, the prime minister says "a US security guarantee is the only way to effectively deter Russia from attacking Ukraine again".
Eighteen of the 80 people on board were injured after the Delta plane overturned on landing.
Witnesses speak about the moment the plane they were flying in overturned in the Canadian city.
The first of up to 390 prisoners are being freed early in an attempt to ease overcrowding in jails.
Pay outstripped price rises by 3.4% between October and December while the unemployment rate remains unchanged.
The UK's highest court has rejected the Treasury's attempts to intervene in the landmark case.
The victim of a shooting in Knockholt is named by police as 43-year-old Lisa Smith from Slough.
The survey hit the headlines in 2021 after asking pupils as young as 14 about their sexual experiences.
The driver probably lost control of the vehicle, causing it to fall more than 2,600ft, police say.
The pontiff will remain in hospital for as long as necessary, the Vatican has said.