Why Russian scientists just deployed a giant telescope beneath Lake Baikal

As I recall Fermi Lab has an ongoing project termed "DUNE" which is using neutrinos in an underground transport perhaps as a precursor for transmitting data. Also, at Fermi Lab and in Japan there are currently neutrino detectors being used for Astronomy. This article was unclear as to the purpose/use of this new Russian detector? Hopefully, there will be a follow-up.