"Ukraine is not a testing ground for weapons," says president Volodymyr Zelenskyy as he warns Russia wants to "spread fear and panic".

Ukraine this week used US and British manufactured longer-range missiles inside Russia for the first time. Earlier this week Vladimir Putin approved a revised Russian nuclear doctrine, which included the provision that if a non-nuclear power attacked Russia with the assistance of a nuclear power,

Moscow's soldiers have 'recently advanced' in the segment under Ukrainian control in Kursk, according to the Institute for the Study of War (ISW).