Three months ago, as Ukrainian troops were struggling to advance against Russian forces in the south, the military’s headquarters in Kyiv quietly deployed a valuable new weapon to the battlefield.
It was not a rocket launcher, cannon or another kind of heavy arms from Western allies. Instead, it was a real-time information system known as Delta — an online network that military troops, civilian officials and even vetted bystanders could use to track and share desperately needed details about Russian forces.