Ukraine has fired UK-supplied Storm Shadow missiles at targets inside Russia for the first time.

According to RT, Russian air defenses say they intercepted two UK-produced Storm Shadow missiles fired by Ukraine over the past 24 hours, the Defense Ministry in Moscow said on Thursday.

The ministry did not specify where exactly the Storm Shadow missiles were intercepted. Moscow has repeatedly warned that such attacks would constitute NATO’s direct involvement in the conflict.

Earlier this week Putin revised Russia’s nuclear doctrine to include provisions allowing Moscow to consider the use of weapons of mass destruction in response to conventional attacks by proxies of a nuclear-armed state.

BBC reports: The war-torn country was previously restricted to using the long-range missiles within its own borders.

Reports of the strikes come after Ukraine was given permission from Washington to fire US-supplied missiles at Russian territory.

The government has refused to comment on the reports for operational reasons, but officials confirmed Defence Secretary John Healey spoke to his Ukrainian counterpart on Tuesday night.

Ministers are likely to exercise caution in their response to the reports due to concerns over Russia’s reaction, as well as to ensure the move is not seen as being led by the UK.

In the Commons earlier, Healey said: “Ukraine’s action on the battlefield speaks for itself.”

Ukraine’s Defence Minister Rustem Umerov has also declined to confirm that his country has used the Storm Shadow missiles within Russian territory, but said it was “using all the means to defend our country”.

Matthew Miller, the US State Department’s spokesman, would also not comment on the use of the UK-supplied missile or whether the US was providing navigational assistance for their use.

When asked by the BBC if Ukraine was consulting with or informing the US about the use of missiles provided by the UK, Mr Miller said he would not “speak publicly to the use of another country’s weapons”.

President Volodymyr Zelensky has repeatedly called on Kyiv’s western allies to authorise the use of long-range missiles against targets inside Russia, saying it is the only way to bring about an end to the war.

Storm Shadow is considered an ideal weapon for penetrating hardened bunkers and ammunition stores, such as those used by Russia in its war against Ukraine.

The US and UK had previously not given permission, with suggestions this was related to not wanting to escalate the war.