KIEV, July 20 - Ukraine's second-largest oil refinery, Linos, owned by Russian oil major TNK-BP, launched in operation a $20 million unit that improves quality of gasoline, the company's press service said Wednesday.

The unit, known as the izomerization unit, has capacity of 300,000 metric tons annually and will allow Linos to produce gasoline that meets European Union quality standards, the company said.