After his election in late 2004 President Viktor Yushchenko promised a "War on Corruption". Several officials were indeed arrested and/or questioned early 2005 (among them later ministers in the Azarov Government Borys Kolesnikov and Yuri Boyko). Former Security Service of Ukraine Chairman Oleksandr Turchynov claimed that in the summer of 2005 Yushchenko prevented an investigation into allegedly fraudulent practices in the transport of Turkmen natural gas to Ukraine and prevented the arrest of Boyko for abuse of office while heading Naftogaz: