NNA - NATO chief Jens Stoltenberg on Friday played down the threat of escalation from Moscow, after the United States authorised Kyiv to use American weapons to hit targets inside Russia.

US officials said Thursday that President Joe Biden had secretly lifted restrictions on Ukraine using American-supplied weapons against targets on Russian territory, but only to defend the under-fire Kharkiv region.

Biden had come under increasing pressure from a desperate Ukraine to ease his ban, but had so far resisted amid fears it could drag NATO into direct conflict or even a nuclear standoff with Moscow.

Russian President Vladimir Putin has threatened "serious consequences" if Western countries allowed Ukraine to use their weapons to strike targets in Russia.

"I welcome that allies are providing support to Ukraine in many different ways, but I will not go into the details," Stoltenberg told journalists at a meeting of NATO foreign ministers in Prague.

"Ukraine has the right for self-defence, and that includes also the right to strike legitimate military targets inside Russia."

The head of the Western military alliance said letting Western weapons hit targets in Russia was "nothing new" as Britain had long sent cruise missiles to Kyiv without restrictions.

"It has also been the case for a long time that every time NATO allies are providing support for Ukraine threatening us to not do that," he said.

"This is part of efforts by President Putin and Moscow to prevent NATO allies from supporting Ukraine to defend themselves, and, again, Ukraine has the right for self-defence and we have the right to help Ukraine."

Pressure had been building on key backer Biden to shift his position on Ukrainian strikes in Russia after French President Emmanuel Macron said Kyiv should be able to hit back against attacks.

Ukraine's outgunned forces are struggling to hold back Moscow's offensive in the Kharkhiv region near the border that has seen the Kremlin launch attacks from its own territory.--AFP

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