This study presents empirical evidence for the behaviour of Russian exporters in the international fertiliser market. Russia is in the spotlight since the potash cartel has collapsed. In 2012, Russia became the world’s second-largest exporter increasing its potash exports from 1996 to 2012 more than two times. PTM approach developed by Krugman (1986, 1987) is chosen to test the market behaviour. Imperfect competition in the Russian export market for nitrogen fertilisers is revealed in two-thirds of the destination countries under study. In the export market for potash, a sufficiently perfect market is found in only one out of 9 countries.