Tensions between the two nations are reaching boiling point as the Kremlin reacted this morning to the latest from London.
Putin’s spokesman Dmitry Peskov this morning reiterated Moscow’s claim the Kremlin had “no connection” to the poisoning of double agent Sergei Skripal in Salisbury and issued a stark warning to the UK.
Russian news agency Tass quoted Mr Peskov as saying: "Moscow's stance is well-known, London was told about Moscow's position through diplomatic channels. Moscow has no connection to the incident that took place in the United Kingdom.
"Moscow won't accept absolutely unfounded accusations against it, which are not substantiated by any evidence, and won't accept the language of ultimatum."
Also speaking this morning, Foreign Minister Sergey Lavrov insisted Russia had “no motive” to want Mr Skripal dead and branded the UK's accusations "not robust and not serious”.
He went on to claim the accusations levelled against Moscow were part of a “Russophobic campaign”.
Earlier this morning, a Kremlin spokesman insisted "common sense" proved there was no Kremlin connection to the attempted murder.The spokesman added: "Any unlawful British actions against Russian media will result in a Russian response."
When probed on when a response might come, the spokesman said it was too early to say what the Russia reaction might be.
It also emerged this morning Russian diplomats are attempting to gain consular access to Yulia Skripal, the daughter of Mr Skripal, who is said to be in a critical but stable condition alongside her father.
Russian news agency Interfax has cited a source as saying the Russian embassy in London plans to today request that officials be allowed to visit the 33-year-old.
Russia last night issued a chilling warning to Britain not to threaten a nuclear power.
Theresa May has accused Russia of direct involvement in the poisoning of former spy Mr Skripal who was targeted with a Soviet-era, military-grade nerve agent known as Novichok.
The PM is expected to impose tough sanctions against Moscow this morning, including booting out Russian diplomats and seizing assets from Russian cronies.
Russia is not afraid of any ultimatums the United Kingdom opted for in its investigation into the poisoning of former colonel of Russia’s Main Intelligence Directorate Sergey Skripal and his daughter, said Russian Permanent Representative to the EU Vladimir Chizhov in an interview with TV channel Euronews.
He said: "Unfortunately, London opted for a language of ultimatums. I can say that the language of ultimatums won’t be of any help in dealing with Russia, as Russia is not afraid of anything. I think that both London and other western capitals could see it for themselves. I am disappointed with the debates that are being held in the British parliament and the official statements that are made instead of looking into the whole situation and involving Russia in the investigation."
The UK "is in fact violating the Chemical Weapons Convention, pursuant to which it was obliged to deliver corresponding objective evidence, including samples of that agent, to the party that had fallen under suspicion."