"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,

The escalatory attack comes after Ukraine reportedly used US and UK long range missiles to strike targets inside Russia