Russia arrests Ukrainian biologist for backing curbs on Antarctic krill fishing

Trumped-up' charges spark diplomatic row as scientists express fears for health of 70-year-old Leonid Pshenichnov

• Antarctic krill: how did a paperclip-sized crustacean cause a diplomatic row - and why are they so important?

A diplomatic row has erupted over the illegal" detention of one of Ukraine's scientists, who has been accused by the Kremlin of undermining Russia's industrial trawling for krill in Antarctica.

Leonid Pshenichnov, 70, a Ukrainian biologist who is an expert on Antarctica, has a decades-long record of scientific research and contributions to conservation, including support for marine protected areas in the region.