Two huge ships sailed into the North Sea towards Dover sparking a quick response from the Royal Navy.
Frigate HMS Sutherland spotted Moscow sanctioned sailors in the early hours before alerting the Ministry of Defence.
State-of-the-art radar equipment will be used to track their every movement on Saturday night.
The ships, Soobrazitelny and Boiky, have been made to turn away, but it is not clear where they are headed.
Ministry of Defence
Putin's warships sail off UK coast – British navy scrambled to escort them out
The Royal Navy maintains a vigilant watch and is always ready to keep Britain safe
Sir Michael Fallon
Defence Secretary Sir Michael Fallon said: "HMS Sutherland is carefully marking these Russian ships as they pass close to UK waters.
"The Royal Navy maintains a vigilant watch and is always ready to keep Britain safe."
Commander Andrew Canale, the Commanding Officer of HMS Sutherland, said: "As one of the Royal Navy's high readiness units, HMS Sutherland is required to escort warships that approach the UK and this task is considered routine business for us.
"It is vitally important the Royal Navy demonstrates its presence and commitment to the integrity of UK territorial waters as we work around the clock to secure the seas of our island nation."
MINISTRY OF DEFENCE
The Steregushchiy Class Frigate with its helicopte: HMS Sutherland is escorting two Russian warships
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The ships were spotted after a top US and NATO military officer warned the navy of Russia is imposing itself upon nations with frequency.
Navy Admiral Michelle Howard said there is now more Russian naval activity in Europe than at any point in the Cold War.
Ms Howard, head of NATO's Allied Joint Force Command in Naples, warned a close eye must be kept on the country's manoeuvres at sea.
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The unwanted advance into British waters come as three countries are warning they could be about to go to war.
Donald Trump, US President said he will take on North Korea – and leader Kim Jong-Un, if it continues to test nuclear missiles.
Navy guns on the edge of HMS Sutherland as Russian ships escorted away
The country, in response, has celebrated the Day of the Sun, while parading new ballistic missiles through the streets.
Government officials said they will fight 'all out war' if need be.
China has played the role of peacemaker but said war could be on the cards.
Russian relations with Britain have been frosty in recent weeks after Foreign Secretary Boris Johnson cancelled a trip to Moscow over Putin's support for Syria.