Red Bull motorsport consultant Helmut Marko says that Daniil Kvyat could not cope with the pressure of racing alongside Daniel Ricciardo and insists the Russian's demotion will be beneficial.
Kvyat joined Red Bull at the start of 2015 and finished on the podium in China, but endured a troublesome home race, twice colliding with Sebastian Vettel at the start before trailing home in 15th place.
Kvyat, who was out-qualified 4-0 by Ricciardo across the opening four Grands Prix, will return to Toro Rosso, having raced for the Italian outfit in 2014.
"The decision was made after Russia," Marko said in an interview with Auto Bild.
"It was increasingly obvious that Daniil could not resist the pressure of Daniel Ricciardo and was over driving the car.
"We wanted to take him out of the firing line and help his career so instead of harming it.
"Kvyat has understood it. I do not see this as a demotion. Toro Rosso is on a very good level this year. Max has to assert himself against Daniel, which is not easy.
"At the end of the year the cards will be reshuffled, which also means Carlos Sainz Jr. has a chance."