Kimi Antonelli dominated a bizarre Monaco Grand Prix full of penalties and interrupted by a broken track surface, extending his Formula 1 world championship lead to 66 points as George Russell finished 13th.

Antonelli's Mercedes led by as much as half a minute and lapped all but the top three before a series of bizarre late twists that didn't ultimately threaten his win.

Front row partner Max Verstappen's Red Bull suffered an immediate engine problem at the start and had to retire, and the chasing Ferraris of Lewis Hamilton and Charles Leclerc had no answer to Antonelli's pace.

A crash for Lance Stroll's Aston Martin at the final corner then started the late madness. It prompted a safety car, after which Leclerc crashed out of third at exactly the same place as he prepared for the restart.

The race was stopped as the FIA noted the track surface breaking up at the point where both Stroll and Leclerc had lost control - though both drivers later insisted this hadn't triggered their crashes.

The surface was attended to during a pause of just over half an hour before the race resumed with a standing start, during which Antonelli escaped from Hamilton to secure his fifth straight win, with Hamilton's podium bringing him up to second in the championship, two points ahead of Russell.

A bizarre total of six pitlane speeding penalties shaped much of what happened behind. Hamilton picked up one of those, which he took during the pitstop he made under the Stroll crash safety car.

Russell also incurred one, adding to a miserable race that he'd spent mostly stuck behind Isack Hadjar's Red Bull before jumping it in the scheduled pitstops.

But Russell failed to serve his penalty when he pitted again under the safety car, and was therefore given a drive-through penalty before the final restart.

He jumped Hadjar off the line for third on the road at that restart and then drove slowly for half a lap, creating a six-second gap to Hamilton ahead before seemingly trying to bolt away from the cars he'd stacked up to create more of a gap to take his penalty. The tactic didn't do much for Russell as he still finished outside the points.

In the traffic jam that created, Nico Hulkenberg punted Carlos Sainz's Williams into a spin exiting the Loews hairpin, with Sainz then hit again by Franco Colapinto's Alpine at Portier.

Hulkenberg was given a 10s penalty for that incident.

Pierre Gasly finished third on the road for Alpine, having also jumped Hadjar at the final race restart, but Gasly had notched up two pitlane speeding penalties so fell to seventh in the results.

Hadjar therefore provisionally picks up his first podium for Red Bull but is under investigation for a red flag infringement.

McLaren could only manage a muted fourth on the road for Oscar Piastri, with Lando Norris earlier retiring to the pits amid long-running power unit problems.

Racing Bulls got two cars in the top six with Liam Lawson and Arvid Lindblad.

Williams was heading for a double points finish before Sainz was taken out but Alex Albon at least managed eighth.

The litany of penalties and late retirements meant Esteban Ocon took ninth for Haas and Cadillac scored its first F1 point with 10th for Sergio Perez, though Perez faces a post-race investigation for a suspected out-of-position start after the red flag.

He earlier served a penalty for the same offence at the original race start.

Provisional race result

1 Kimi Antonelli (Mercedes)
2 Lewis Hamilton (Ferrari)
3 Isack Hadjar (Red Bull)
4 Oscar Piastri (McLaren)
5 Liam Lawson (Racing Bulls)
6 Arvid Lindblad (Racing Bulls)
7 Pierre Gasly (Alpine)
8 Alex Albon (Williams)
9 Esteban Ocon (Haas)
10 Sergio Perez (Cadillac)
11 Fernando Alonso (Aston Martin)
12 Gabriel Bortoleto (Audi)
13 George Russell (Mercedes)
14 Nico Hulkenberg (Audi)
15 Franco Colapinto (Alpine)
DNF Carlos Sainz (Williams)
DNF Charles Leclerc (Ferrari)
DNF Lance Stroll (Aston Martin)
DNF Lando Norris (McLaren)
DNF Ollie Bearman (Haas)
DNF Valtteri Bottas (Cadillac)
DNF Max Verstappen (Red Bull)