Red Bull and Toro Rosso have both signed two-year deals to run Renault power over until the end of 2018.
The stewards have decided to take no further action on Daniil Kvyat after his Toro Rosso car failed a front floor deflection test.
The stewards are conducting an investigation into the legality of Daniil Kvyat's Toro Rosso after it failed a front floor deflection test following qualifying for the Monaco Grand Prix.
Toro Rosso technical director James Key plays down rumours of a move following speculation he is a Ferrari target.
Daniil Kvyat says onus is on FIA to come up with workable solution for visor tear-offs after a fudged compromised was reached in Monaco.
Daniil Kvyat says Wednesday's test day was important as he continues adapting his driving style around Toro Rosso's STR11.
Russian believes he could have been the man on the top step of the podium in Spain after seeing Red Bull replacement Max Verstappen win in Spain.
Daniil Kvyat says his first day back with Toro Rosso felt like returning home.
Carlos Sainz says he has 17 races to prove to Red Bull he is worthy of following Max Verstappen's step up to the senior team.
Former Red Bull driver thinks Daniil Kvyat's demotion to Toro Rosso is "harsh" but unsurprising due to the ruthless nature of Formula One.
Max Verstappen's former race engineer Xevi Pujolar has confirmed his departure from Toro Rosso.
Helmut Marko says Daniil Kvyat's seat switch from Red Bull to Toro Rosso was to help the Russian revive his career "out of the firing line".
Red Bull has confirmed Max Verstappen and Daniil Kvyat will switch seats, effective immediately, from the Spanish Grand Prix.
Ex-Manor team principal John Booth has joined Toro Rosso as director of racing on a consultancy basis.
Toro Rosso's year-old power unit is the least powerful engine on the grid, according to Mercedes' data.
After ignoring team orders at the Australian Grand Prix to let Max Verstappen past, Carlos Sainz says it is up to his team-mate to clear things up with Toro Rosso, not him.
Max Verstappen says he does not care about Toro Rosso team orders because he should have been "miles ahead" of Carlos Sainz at the Australian Grand Prix.
Carlos Sainz says Toro Rosso left valuable points on the table following a disappointing Australian Grand Prix.
Max Verstappen labels his Australian Grand Prix "a bit unlucky and not good" and admits frustrations with team-mate Carlos Sainz and Toro Rosso's strategy.
Red Bull motorsport advisor denies 2016 is a shootout between company's four drivers but makes it clear poor performances will not be tolerated in 2016.
Technical director James Key calls Toro Rosso's impressive winter lap haulage the "best-case scenario" it could have hoped for heading into the winter.
After his first week of pre-season testing with Ferrari engines, Max Verstappen is happy with Toro Rosso's switch to a year-old Ferrari engine from Renault for this year.
Kimi Raikkonen returned Ferrari to the top of the timing screens as McLaren completed just three laps due to a coolant leak detected early in the morning.
Force India's Nico Hulkenberg tops the third day of testing as McLaren becomes the only team to fail to register a race distance following a hydraulics failure.
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