He could be on the tarmac of Sheremetyevo International Airport, Putin will order his plane refueled and maybe also send some Borscht and Russian Tea*. And then demand they leave.
A Biden win means they have to start repairing some relations with the USA, as there romp around the world won't be unhindered anymore.
He's going to have to go to somewhere like Brazil. Where they are thankful for transferring the soybean market we sell to China from our country to theirs.
And going by memory, it may have changed, we don't have an extradition treaty with them.