A campaign of Russian attacks on Ukrainian ports in the Black Sea have virtually halted all grain shipments. The ports usually account for about 90% of Ukraine's green exports, and the strikes have caused a severe setback for the country's economy. Bloomberg's Pyotr Kozlov is joining us here in studio this morning to talk about this.Pyotr, tell us what this means for Ukrainian farmers. Well, Ukrainians farmers are suffering this year, especially dramatically, given that the strikes from Russia has intensifi ...