Although there are a number of different bodies working towards accountability for war crimes and crimes against humanity, Ukrainian Ambassador at Large Anton Korynevych argued that these existing mechanisms do not do enough to ensure that the decision-makers in Moscow face punishment for their war against Ukraine.Lesia Zaburanna, a Ukrainian Parliament member, said it is a matter of justice, which is the “main request of the Ukrainian people.” There are roughly ten thousand civilians who have been killed throughout the nearly ten months of the conflict, she said.Their crime is a crime of waging aggressive war, because this crime gave birth to all the other crimes.”In the United States, a bipartisan resolution was introduced in the House of Representatives by Reps. Bill Keating, a Massachusetts Democrat, and Joe Wilson, a South Carolina Republican, to call for creation of a special tribunal on the crime of aggression, but administration officials have neither committed to nor rejected the idea.“We seek to remain in lockstep with Kyiv’s strongest partners as we consider Ukraine’s proposal for a special tribunal, as well as all other options for holding Russia and its leaders to account.”Korynevych and Zaburanna said they met with lawmakers, as well as officials from the Departments of State and Justice, to push for support of the tribunal.He said the tribunal could be negotiated “within a matter of weeks” and then set up by May or June, although the process of achieving justice will take “many, many years.”CNN’s Kylie Atwood contributed to this report."