Ukrainian military experts have welcomed Washington’s decision - saying it will not necessarily change the course of the war, but will restore a little balance. This comes at a time when Russian forces are creeping forward all along the eastern front and Ukraine feels it has been on the back foot for several months.

America first gave Ukraine HIMARS rocket launchers in the summer of 2022, though equipped only with shorter-ranged GPS-guided rockets. In late 2023, after over a year of debate, it relented and provided the 300km-range ATACMS.

Russia has warned that any approval from the Biden administration to use ATACMS missiles would be viewed by the country as an act of escalation.

President Joe Biden has for the first time authorized the use of U.S.-supplied long-range missiles by Ukraine to strike inside Russia.

The US has for the first time allowed Ukraine to use long-range missiles to strike targets inside Russia. The outgoing Biden administration has told Kyiv it can use US-made ATACMS missiles for limited strikes inside Russia,

President Joe Biden has authorized Ukraine to use long-range ATACMS missiles inside Russia, two U.S. officials confirmed to ABC News on Sunday.

President Biden has approved Ukrainian President Volodymyr Zelenskyy's regime to strike targets within Russia using American long-range missiles.