Ukrainian President Volodymyr Zelensky offered assistance to wildfire-ravaged Los Angeles, saying Ukraine's firefighters can "help Americans save lives" as the city struggles to combat new blazes.

Deadly infernos have ripped through Los Angeles, killing at least 24 people in less than a week, reducing entire communities to scorched rubble, and leaving thousands without homes.

Conditions could dramatically worsen in the United States' second-largest city as strong gusts fan flames and whip up embers, with firefighters warning the blazes could move from existing burn zones into new areas.

Zelensky said Sunday evening that he had instructed Ukraine's minister of internal affairs "to prepare for the possible participation of our rescuers in combating the wildfires in California."

"The situation there is extremely difficult, and Ukrainians can help Americans save lives," he said in a video posted on social media platform X, adding that the aid is "currently being coordinated."

"150 of our firefighters are already prepared."

The United States, under President Joe Biden, has been Kyiv's biggest wartime backer, providing military aid worth more than $65 billion since Moscow's invasion in February 2022.

Incoming president-elect Donald Trump has promised to resolve the conflict in "24 hours" once in office, raising fears in Ukraine that it will be forced to make major concessions in exchange for peace.