While many questions remain, the move by the US to green light the use of missiles inside Russia will no doubt lead US allies to do the same – and provoke Russia’s ire.

Ukraine has been pleading with the US for months to let it use American-made weapons to hit military targets inside Russia beyond the border zone. Now, as he nears the end of his presidency, Joe Biden has relented and decided to lift some restrictions,

President Biden's decision to allow Ukraine to fire U.S.-made and supplied missiles deeper into Russia — a major policy shift announced over the weekend after months of intense lobbying by Kyiv — has drawn a furious response from Moscow.

Putin approves updated Russian nuclear doctrine as Ukraine marks 1,000 days of war. European troops could be needed for Ukraine peace says Estonia 09:34Jennifer Rankin Jennifer Rankin is the Guardian’s Brussels correspondent European nations should be ready to send troops to Ukraine to secure any peace deal between Kyiv and Moscow orchestrated by Donald Trump,