Who was to blame for Perez-Sainz Azerbaijan GP crash?

Carlos Sainz and Sergio Perez had a dramatic crash on the penultimate lap of the Azerbaijan Grand Prix. 

The two drivers were involved in a fight for second place with Charles Leclerc at the Baku City Circuit, before coming to blows on the back straight between the second and third corners. 

Sainz had moved ahead of Perez out of the first corner after the Red Bull driver had a poor exit, caused by trying to overtake Leclerc. 

Perez did, however, get a much better run than Sainz through the second turn, with the Spaniard having been slightly wide due to being on the outside of his Ferrari team-mate. 

This allowed Perez to pull alongside Sainz, before contact was made at high-speed, sending both drivers into the wall. 

Who was to blame for the crash?

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