Daniil Kvyat has apologised to Ferrari rival after they clashed on the opening lap for a second successive race in Russia.
Kvyat hit Vettel under braking for Turn 2 and clipped the Ferrari driver once more at Turn 3, the latter contact sending Vettel into the barriers.
Kvyat was handed a 10 second stop and go penalty for causing the collision and had three penalty points added to his license.
"There was a bit going on obviously in the last moment I didn’t expect to slow down so much I started to press the brake pedal but there was not much in it and started to lose control," he said, after finishing a lowly 15th.
"The second touch I couldn’t see what was going on ahead, he slowed down a lot and I didn’t have time to react.
"All the mess came from me, I don’t feel great, but sometimes these things happen, probably the messiest T1 in my career and I will learn from it. I apologise to everyone involved and I will learn from it."
Vettel failed to make it past the first lap for the second time in three Grands Prix, having retired on the formation lap in Bahrain.
"It was fairly clear," he said. "I just saw the footage. I got a big hit.
"I was lucky not to spin into Turn 2, but then I got another huge hit that turned me around. I couldn't avoid the barriers."