UKRAINE has blitzed Russia’s iconic Kerch bridge with more than a tonne of underwater mines – and hinted there could be more.

The pre-dawn blast sent a plume of water erupting into the sky .

Ukraine's SBU intelligence service said the blast left the bridge in an "emergency state" after devastating its foundations.

It was at least the third attempt to destroy the key road and rail link from Russia to occupied Crimea.

The same SBU special forces unit behind Sunday’s historic drone strikes in Russia claimed responsibility for the pre-dawn attack .

They claimed their agents spent months mining the substructure of the 12 mile road and rail link.

The SBU said: “The SBU conducted a new unique special operation and struck the Crimean Bridge for the third time — this time underwat

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