Senior Ukrainian officials visited Washington on Tuesday seeking U.S. support against Russia, as Kyiv showed its ability to fight on by setting off an explosive device under a bridge that has become a symbol of the Kremlin's claims on Ukrainian territory.

A day after talks in Istanbul that made little progress toward ending the war, now in its fourth year, Ukraine's SBU security service said it had hit a road and rail bridge that links Russia and Crimea below the water level with explosives. The extent of any damage was not clear.

The bridge is a flagship project for Russian President Vladimir Putin, built after he annexed Crimea from Ukraine in 2014, in a precursor to the latest conflict.

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