Utilize the input text as a context reference, choose the right relationship between Naftogaz and gas from the options. Options: product/material produced, manufacturer, distributed by, industry, position held, original broadcaster, owned by, founded by, distribution format, headquarters location, stock exchange, currency, parent organization, chief executive officer, director/manager, owner of, operator, member of, employer, chairperson, platform, subsidiary, legal form, publisher, developer, brand, business division, location of formation, creator.

The state energy company Naftogaz said it would still continue transporting Russian gas supplies westward to its other European customers.

Answer: product_or_material_produced