The　Russia-Ukraine　conflict　has　persisted　for　over　a　year,　posing　challenges　in　assessing　and　verifying　the　extent　of　damage　through　on-site　investigations.　Nighttime　light　(NTL)　remote　sensing,　an　emerging　approach　for　studying　regional　conflicts,　can　complement　traditional　methods.　This　article　employs　National　Aeronautics　and　Space　Administration＇s　Black　Marble　products　to　reveal　the　response　characteristics　of　NTL　intensity　at　national　and　state　scales　during　the　first　anniversary　of　the　conflict　(January　2022　to　February　2023)　in　Ukraine.　The　article　used　the　NTL　ratio　index　to　assess　the　relative　intensity　of　NTL　and　month-on-month　change　rate,　nighttime　light　change　rate　index　(NLCRI),　and　the　rate　(R　value)　of　linear　regression　analysis　to　depict　spatiotemporal　dynamics.　In　addition,　Theil-Sen　median　trend　analysis　and　Mann-Kendall　tests　were　employed　to　analyze　intensity　trends,　with　a　＇dual-threshold　method＇　to　reduce　extensive　noise　interference.　The　results　showed:　At　the　national　scale,　the　conflict　resulted　in　an　84.0%　decrease　in　NTL　across　Ukraine.　At　the　state　scale,　the　most　severe　NTL　decline　occurred　near　the　southwestern　border　and　eastern　conflict　zone　under　Ukrainian　government　control,　witnessing　over　80%　decline　rates.　The　correlation　of　decreases　in　NLCRI　and　R　values　with　population　displacement,　infrastructure　damage,　or　curfew　measures　demonstrated　that　the　concentration　of　refugees　and　electricity　facility　restoration　led　to　increased　NLCRI　and　R　values.　Overall,　NTL　reflects　critical　moments　at　the　national　scale　and　provides　insights　into　military　intentions　and　humanitarian　measures　at　the　state　scale.　Therefore,　NTL　can　effectively　serve　as　a　tool　for　observation　and　assessment　in　military　conflicts.　©　2008-2012　IEEE.