Environmental watchdog Earthsight has accused Ikea of sourcing illegally logged Russian pine wood for use in its children's furniture.

After examining Ikea's supply chain for more than a year, Earthsight published a report, which claimed the retailer "sourced pine from a group of companies guilty of illegally logging some 4 million trees in the climate-critical forests of Siberia over the past decade.”

The specific supplier is ExportLes, a Siberian timber company controlled by Russian politician Yevgeny Bakurov. Court records show that Russian authorities have also accused Bakurov and ExportLes of breaches of environmental and forestry laws. 

Ikea told Earthsight and NBC News that it has cut ties with ExportLes. The retailer denied wrongdoing and said it followed all the correct legal procedures.

Ikea is the world's largest furniture retailer, operating more than 400 stores across 50 countries. Russia is the company's second-largest source of wood.