KYIV (Reuters) - Ukraine is working with international partners to create a United Nations-backed mission to restore Black Sea shipping routes and export Ukrainian farm produce, foreign ministry spokesman Oleg Nikolenko said on Thursday.

       Russia has captured some of Ukraine's biggest seaports and its navy controls major transport routes in the Black Sea, blocking Ukrainian shipments and deepening a global food crisis.

       "We call on countries whose food security may suffer more from Russian aggression against Ukraine to use their contacts with Moscow to force it to lift the blockade of Ukrainian seaports and end the war," Nikolenko wrote on Facebook.

       (Reporting by Natalia Zinets; writing by Matthias Williams; editing by John Stonestreet)