Daniil Kvyat has backed the complaints of two multiple champions as today's face of Formula 1 comes under the microscope.

Fernando Alonso and Sebastian Vettel could not hide their frustration when asked about the latest radio restrictions and the new track surface and kerbs at the Hungaroring ahead of this weekend's action.

German Vettel called the radio changes "bullshit" and a "joke", while Alonso warned that unless the 2017 regulations change the sport significantly, he will not extend his stay beyond the end of next year.

Spaniard Alonso said that there are too many rules in general, joking: "You are allowed to breathe and not much more.

"At the same time I believe McLaren-Honda is slowly coming forward. I want to win again and at the same time have fun in F1. At the moment it's not possible in these cars."

Vettel hit out at the new, ultra-smooth track surface and kerbs in Hungary.

"It's a bit sad because the kerbs are part of the character and soul of a track and when they're the same everywhere, every track feels the same," he said.

"The kerbs before were also a challenge, same with the bumps. Let's see if some of them are still there but it would be a shame if they're all gone."

The FIA has also installed electronic sensors in some of those new kerbs to strictly police 'track limits'.

Toro Rosso driver Kvyat argued: "If we had normal kerbs then you wouldn't need the electronics. Let's see how it is but in my opinion it is the wrong direction.

"The limits of the track should be obvious because if you cross it, you lose time and your lap is ruined. You can't just tell drivers who attack at the limit 'Don't go there'."

The young Russian also joined the criticism of the further radio clampdown, declaring: "They keep changing the rules every weekend.

"I have ceased to understand them but I think no one really does."

Thirteenth-placed Kvyat sits three points behind teammate Carlos Sainz going into tomorrow's race.