Is Putin O or AB?

Putin's blood type is either O or AB.

[Evidence of Type O]

Source: Blood Types of Celebrities and Foreigners

*Letters in red are translated from Russian using OCR and machine translation.

[Evidence of Type AB]

Source: 22:00-22:54 on May 21, BS-TBS, Foreign Reporters Saw Plus
Why do Japanese like blood types ? -- The nationality of typing things

What is certain is that President Putin and Prime Minister Medvedev have the same blood type.
This information is available to many media.
But the blood type was not disclosed at that time, so I don't know what type they are.
I suppose it is O, but what type is it actually?