REUTERS

Ukraine has formally "requested consultations" with Kazakhstan, the first step in a trade dispute, which opens a 60- day window for Kazakhstan to settle the matter or face potential litigation, Reuters said.

Read alsoU.S. delays introduction of anti-dumping duty for Ukraine pipesThe dispute is the first to target Kazakhstan, which joined the WTO in 2015 and is part of the Eurasian Economic Union which includes Russia and other former Soviet countries.