A minor error has been noted. The first line should be Moscow. The puzzle as shown is correct.
The final answer is a single word.
The world ended today. Not with a bang, but a whimper–it sounds so cliché, but it's the only way to describe what happened. All our preparations were for naught because the elite team we assembled to fight for us were too busy playing around instead of taking action.
I've compiled a list of when our operatives called us this morning to report the bad news. When Washington reported that they had fallen, I knew it was all over and that humanity had lost. Hopefully this record will help future civilizations piece together what happened and realize that inaction is not the answer.
– Brenda F.
Moscow Milan Lagos Essen Tokyo Hong Kong Atlanta Seoul Khartoum Beijing San Francisco Cairo London Buenos Aires Sydney Chennai Cairo London San Francisco Khartoum Milan Seoul Hong Kong Buenos Aires Sydney Beijing Mexico City Mexico City Sydney Karachi Sydney Mexico City Karachi London Seoul Khartoum Chennai Cairo Hong Kong San Francisco Beijing Buenos Aires Washington Washington
Either the text version or the picture version could provide the needed information for the puzzle on their own.