President Joe Biden has authorized Ukraine to use powerful long-range American weapons inside Russia, according to a senior US official familiar with the decision, as North Korean troops deploy in support of Moscow’s effort.

Not for the first time, Poland scrambled fighter jets as missiles headed for western Ukraine. And in the capital, Kyiv, fragments from intercepted missiles and drones fell in several places, but there were no reports of injuries.

Joe Biden has allowed Ukraine to strike inside Russia with long-range US missiles. Meanwhile, at least seven people have been killed in one of Russia's largest air attacks on Ukraine targeting the country's energy grid ahead of the winter months.