Investigative journalist Aric Toler said his Bellingcat organisation had "been monitoring this stuff non-stop for eight years".He agreed it spelled an invasion, adding: "So, assume the worst, I guess/fear."
"It appears Russian forces near the border are painting markers, in this case 'Z,' on vehicles to identify different task forces or echelons," he said on Twitter.Others online suggested it stands for "Zorro squad" referring to the whole invasion force, or a secret name for a new unit.
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