Full story : https://www.reddit.com/r/leagueoflegends/comments/1kq9dro/honda_ending_sponsorship_with_team_liquid_after/
TLDR : Lucas Dias, a Brazilian a R6 player from Team Liquid, sent Hiroshima bombing gif to a Japanese team (CAG OSAKA) after losing to them in a tournament on twitter when the main sponsor of his team is a Japanese brand. Also the gif doesn't come out unless you search the term "Hiroshima" so it wasn't really a "oops, mistake" thing. He sent the thing knowing exactly what it was. Initially Honda didn't terminate but was investigating the situation but as of now, Honda has terminated all contracts with Team Liquid.
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