"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 United States said it had reopened its embassy in Kyiv late on Wednesday after it had shut for the day due to what it called the threat of a significant air attack, a day after Ukraine used American missiles to hit a target inside Russia.