One version of Baby Three doll appears to bear a mark resembling the shape of the ocean border on which China bases its illegitimate claim to most of the South China Sea

Regional tensions over the South China Sea have tanked the sales of a popular children’s doll in Vietnam after it was put under investigation and accused of being unpatriotic because a design marking appeared to resemble China’s “nine-dash line”.

The Baby Three doll is Chinese-made and had reportedly been hugely popular among children and Gen Z in Vietnam earlier this year. Between September, when it first gained popularity, and December the dolls reportedly generated US$1.6m in sales.