Snake Island: Ukraine says soldiers killed after refusing to surrender

Ukraine has honoured 13 soldiers who were killed defending a tiny island after reportedly swearing at a Russian ship that ordered them to surrender.

In unverified audio clips, the borders guards defending Zmiinyi Island in the Black Sea are told to "lay down your weapons" or "be bombed".

"Russian warship, go to hell," they respond.

Ukraine says they were then killed by air and sea strikes. Russia denies the account, saying they all surrendered.

Ukraine's President Volodymyr Zelensky has awarded each of the guards the posthumous title of "Hero of Ukraine".

"On our Zmiinyi Island, defending it to the last, all the border guards died heroically," Mr Zelensky said.