Foreign Secretary Boris Johnson has condemned Russia's bombing of Syria and called for demonstrations to be held in London
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The Russian aircraft carrier Admiral Kuznetsov at a ship-repairing yar
Putin awarded peace prize after bombing Aleppo and shipping nukes to EU border
Mi6 head Sir John Sawers has warned the firebrand comments of the Foreign Secretary could lead to reprisals from Moscow.
Sir John urged caution on BBC Radio 4's Today programme.
He said: "We all have to be a little bit careful and mindful of the security of our embassy in Moscow when we think about calling for demonstrations here in London.
"We all recall what happened to our embassy in Tehran three or four years ago. I don't think that would happen in Moscow but we need to be careful about the consequences of things that we call for."
And he went on to describe the "dangerous" situation Britain finds itself in following Russia's increasingly-aggressive behaviour.
In September patrol ship HMS Tyne was called on twice in a month to escort Russian warships through the channel.
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Russia's Admiral Kuznetsov and up to seven other vessels could pass within a mile of the British coast
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UK warships, possibly including HMS Richmond, are being scrambled to escort the Russian fleet
Russia's relations with the west are rapidly deteriorating and Putin sent a ship loaded with an Iskander-M missile system to Kaliningrad, a small Russian enclave located between Poland and Lithuania, in a bid to boost his sphere of military influence.
In July Putin's spy planes were flying strategic missions over the UK - but the Ministry of Defence did not object due to the "open skies" treaty.
In June Putin sent sent a 210ft attack sub into the English Channel just days before England were due to battle Russia during Euro 2016.
In its own display of strength The Sun sent an armada out to meet the vessel, complete with a lookalike of Three Lions striker Jamie Vardy dressed as Lord Nelson.
In 2014 two Russian warships entered the English Channel just a day after a UK destroyer acted to head off a Russian aircraft carrier.
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