As the Russia-Ukraine war is largely stuck in a bloody stalemate, Crimea is becoming an increasingly important battleground. Satellite images show Russia has constructed marine defenses across Crimea to protect its key assets, including the Kerch Bridge. The bridge has already been attacked twice by Kyiv and there could be further strikes at the crossing. WSJ looks at why the $3.6 billion Kerch Bridge is key to both Kyiv and Moscow.Chapters:0:00 The Kerch Bridge1:25 First attack on Crimea2:25 Second attack on Crimea 3:40 Russian defenses