[1/2] Ukrainian artillery fires towards the frontline during heavy fighting amid Russia's attack on Ukraine, near Bakhmut, Ukraine, April 13, 2023. REUTERS/Kai Pfaffenbach/File Photo TOKYO, June 2 (Reuters) - The United States is seeking to secure supplies of TNT in Japan for 155mm artillery shells, as Washington rushes weapons and ammunition to Ukraine for a counteroffensive against Russian forces, two people familiar with the matter told Reuters. For war-renouncing Japan, any procurement would test its willingness to court controversy to help Kyiv because export rules ban Japanese companies from selling lethal items overseas, such as the howitzer shells that Ukraine...