Just days into Russia's brutal invasion of Ukraine, a team of Ukrainian lawyers huddled together on a train out of Kyiv, crafting their case for the International Court of Justice (ICJ).

"It was not the easiest task, of course, the second day or the third day of the full-scale invasion of Russia, but we did it," said Anton Korynevych, Ukraine's top lawyer at the ICJ, who filed the case in The Hague on Feb. 26, 2022.

"We understood that, of course, the main battlefield is on the ground. ... But we also understood that we government lawyers needed to do our job and we needed to pursue justice," Korynevych said in an interview at the Ukrainian embassy in The Hague.