A Storm Shadow strike launched last week has reportedly killed around 500 North Korean Troopers and a Russian general.
It has been claimed a Russian general and 18 Putin officers were killed, with a further 18 reportedly wounded.
The toll relates to the November 20 attack by Ukraine, the first to use UK Storm Shadow missiles deep inside Russia.
It was known the pinpoint missiles had hit a Putin command post and military facility, and the strike reportedly killed Lt-Gen Valery Solodchuk, reports The Mirror.
It has been claimed a Putin general has been killed in the attack
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Russian authorities have not confirmed losses which would be grievous to both Russia and North Korea if confirmed, and they are yet to be independently verified.
Russian President Vladimir Putin has already threatened to strike the UK and US with a new ballistic missile, following its use against targets in Ukraine. The threat came after Russia launched a missile strike on the city of Dnipro using a weapon with a range of "several thousand kilometres."
"In response to the use of American and British long-range weapons on November 21 of this year, the Russian armed forces launched a combined strike on one of the facilities of the Ukrainian defence industry," Putin said in a televised address.
The Russian leader warned that his country would target military facilities in nations that allow their weapons to be used against Russian targets. The new missile's range could potentially reach London, with the distance between Moscow and the British capital being approximately 2,500km.
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Putin has threatened the West
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Meanwhile, Moscow has also threatened that use by Ukraine of NATO-supplied missiles meant Putin could legitimately hit back with nuclear missiles. T
he Russian officers reportedly killed are from Putin’s Southern and Eastern Military Districts. US-based Global Defense Corp reported that 500 North Korean soldiers were killed alongside Russian officers.
Some 10,000-plus North Koreans are believed to have been moved across Siberia to the war zone after being ordered to serve Putin by their leader Kim Jong Un. They are either currently fighting for Putin or about to be deployed.
Storm Shadow missiles on November 20 reportedly hit the sanatorium of the Russian Presidential Affairs Directorate in Maryino, a former Tsarist estate.
It comes after a defence minister has said the UK will not be put off supporting Ukraine by the "irresponsible rhetoric" of Vladimir Putin.
Defence procurement minister Maria Eagle spoke to journalists as she opened an office for Rolls-Royce Submarines in Glasgow.
The MP for Liverpool Garston said: "We’ve heard this kind of irresponsible rhetoric from him (Putin) before. He’s trying to stop nations supporting Ukraine, whilst he doesn’t seem to mind that much about the support he’s getting from North Korea and other nations.
"We can’t allow ourselves to be put off from supporting Ukraine, and we won’t be."