It is stated in this Guardian article (Macron was kept away from Putin in Kremlin for ‘refusing Russian Covid test’), that Macron refused a Russian Covid test because France did not want Russia to get Macron's DNA.
But the two sources, who have knowledge of the French president’s health protocol, told Reuters Macron had been given a choice: either he accepted a PCR test done by the Russian authorities and was allowed to get close to Putin, or he refused and had to abide by more stringent social distancing.
“We knew very well that meant no handshake and that long table. But we could not accept that they get their hands on the president’s DNA,” one of the sources told Reuters, referring to security concerns if the French leader was tested by Russian doctors.
Why did France not want Russia to get Macron's DNA? What could Russia do with his DNA if they got it?
And if Russia really wanted to get his DNA, could they not have taken it from a cup or glass (or bottle) that he drank from? Or from a fallen hair next to the chair he sat in?