Stikeman Elliott, one of the largest firms in Canada, has grabbed lead roles on two major M&A deals announced Monday.

The firm is advising Russia’s state-owned AtomRedMetZoloto (ARMZ)—the successor to the Soviet Union’s nuclear industry—in connection with its $1.3 billion acquisition of Canada’s Uranium One, while representing Toronto-based Harry Winston Diamond Corporation on the $1 billion sale of its watch and jewelry unit to The Swatch Group of Switzerland.