KIEV/MOSCOW, Dec 29 (Reuters) - Ukrainian government forces and pro-Russian separatists in eastern Ukraine have started an all-for-all prisoner swap, after which all remaining prisoners of the five-year conflict should return home, Russian news agencies reported on Sunday.

The swap agreement was concluded by Russian leader Vladimir Putin and Ukrainian President Volodymyr Zelenskiy in Paris in December. (Reporting by Pavel Polityuk and Vladimir Soldatkin; editing by Richard Pullin)