President Joe Biden has authorized Ukraine to use a powerful American long-range weapon for limited strikes inside Russia in response to North Korea’s deployment of thousands of troops to aid Moscow’s war effort, according to two senior US officials. The Biden administration fears that more North Korean special forces units could follow in support of this effort. The move precedes by two months the return to the White House of President-elect Donald Trump, who has signalled he intends to end the war between Russia and Ukraine, though without offering details of how he will do so. The initial Ukrainian effort is expected to focus on and around the Kursk region, though it could expand, according to the official and another person familiar with the matter. Show moreShow less