In late February, Mykhailo Tkach traveled to Poland's border with Belarus to film trucks loaded with Russian grain crossing freely into the European Union.
The Ukrainian journalist, who was eventually detained by police, wondered on camera why, to the south, Polish farmers were blocking Ukrainian grain and other agricultural imports while Russian goods worth millions of euros were flowing in unimpeded.
The border protests have driven a wedge between Poland and Ukraine and pose an uncomfortable dilemma for Prime Minister Donald Tusk, who has called himself Kyiv's biggest ally in its war against Russian aggression.