It said Thursday it had joined the WCA to work on securing the long-term sustainability of the coal industry.

"Our products are delivered to 1,900 customers in 42 countries across the globe, so we know the challenges the coal sector faces now," the company said.

"Working with other actors in the global market, we look forward to continue contributing to responsible development of the coal industry, providing solutions for rising energy needs to ensure global energy security while meeting the highest environmental standards."

SUEK operates 15 underground and 12 openpit mines in Siberia and the Far East of Russia, making it the largest Russian coal exporter and supplier to the domestic market.

WCA CEO Benjamin Sporton said the association was continuing to demonstrate the "vital role" of coal in delivering sustainable development and energy security.

"The WCA's main goal is to secure the long-term sustainability of the coal sector, and bring together stakeholders to encourage innovation and leadership. SUEK's membership reflects the importance of Russia to the global coal industry," he said.

The addition of SUEK is a win for the WCA after BHP, one of the world's largest exporters of coal, confirmed in early April that it was leaving the association.