Mystery surrounds who they are, how they were seized and what happened when they were spirited into Hungary.
Ukraine says three of the men have now been released and have returned home.
But the two countries are still at loggerheads, with Hungary’s foreign minister accusing his Ukrainian peer of making false accusations.
Relations between the Hungary and Ukraine have been strained throughout the war.
Hungarian Prime Minister Viktor Orban is the only European Union leader to have maintained relations with Russia’s Vladimir Putin.
The release of the Ukrainian soldiers, who are all ethnic Hungarians, into Hungary, could have made things better, but it has only made ties worse, and diplomats are lamenting a missed opportunity.
