In May 2016, the IMF mission chief for Ukraine, Ron van Rood, stated that the reduction of corruption was a key test for continued international support. In 2015 Transparency International ranked Ukraine 130th out of 168 countries in its Corruption Perceptions Index. In February 2016 historian Andrew Wilson assessed progress in reducing corruption as poor as of 2016. Aivaras Abromavičius, Ukraine's then Minister of Economy and Trade, resigned in February 2016, citing ingrained corruption. In October at a conference for foreign investors, corruption and lack of trust in the judiciary were identified as the largest obstacles to investment.