London, England (CNN) -- Rare photos of Russian strategic bomber jets purportedly intercepted in British airspace show Moscow's war machine is becoming increasingly bold, analysts said Thursday as Russia denied any territorial violations.

Britain's Ministry of Defence released images it said were taken earlier this month of two Russian Tu-160 bombers -- known as Blackjacks by NATO forces -- as they entered UK airspace near the Outer Hebrides islands off Scotland's northwest coast.

It said the March 10 incident, which resulted in crystal clear images of the planes against clear blue skies and a dramatic sunset, was one of many intercepts carried out by British Royal Air Force crews in just over 12 months.

"This is not an unusual incident, and many people may be surprised to know that our crews have successfully scrambled to intercept Russian aircraft on more than 20 occasions since the start of 2009," Wing Cdr. Mark Gorringe, of the RAF's 111 Squadron, said in a statement.

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