In July, the US Air Force Air Education and Training Command issued a tender on a US government website seeking to acquire samples of ribonucleic acid (RNA) and synovial fluid from Russians. The listing specified that the samples – 12 of RNA and 27 of synovial fluid – must be provided by Russian donors of Caucasian origin. It also wants information on the donor’s sex, age, ethnicity, weight, height and medical history. Notably, the Air Force said, it would not consider tissue samples from Ukraine.