Russian law enforcement has identified Samir Yusupov, 25, from the Krasnodar region in Russia, as the alleged owner of the red-coloured International Prostar truck, which, according to investigators, exploded on the Crimean Bridge. They are still investigating who was driving the truck when it exploded.
The attack could cut supplies to Putin's forces as Ukraine makes more advances in the south towards Kherson. A section of the bridge has collapsed into the sea and seven oil tankers on a train caught fire in the blast.
Long fuel lines are already forming in Crimea, despite Russian claims to have enough supplies to last two weeks.
Although Kyiv has not claimed responsibility for the attack, one Ukrainian official boasted that 'Putin should be happy. Not everyone gets such an expensive birthday present' - a reference to the Russian president's 70th birthday yesterday.
The bridge opened by Vladimir Putin in 2018 was supposed to be protected by land, sea and air - including a high-tech truck scanner for detecting explosives.
However, images released show the truck suspected of causing the explosion being briefly searched by officials before being allowed on its way.