I know that at least two of you readers out there have been keeping an eye on tit for tat WTO disputes. Here's another.
On May 7 of this year, Russia requested consultations with Ukraine in Ukraine - Anti-Dumping Measures on Ammonium Nitrate.
And now on October 21, Ukraine requested consultations with Russia in Russia - Measures Affecting the Importation of Railway Equipment and Parts Thereof.
Obviously, there are some other issues between Ukraine and Russia that are part of the mix as well.