US President Joe Biden has given Ukraine permission to use American-supplied weapons to strike targets in Russia, but only near the Kharkiv region, US officials have said.
One official said his team had been directed to ensure Ukraine was able to use US weapons for "counter-fire purposes" to "hit back at Russian forces hitting them or preparing to hit them".
Russian forces have made gains in the north-eastern Kharkiv region in recent weeks after a surprise offensive in the area, close to the border with Russia.
European leaders and the UK had called for restrictions on the use of such weapons to be relaxed, despite concerns that such a development could further escalate the conflict.
President Vladimir Putin warned that attacks by Ukraine on Russia with Western missiles risked triggering a wider war.
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