They hadn't started to fight yet, but letters of help were being sent like crazy. The President felt helpless - Indonesia was too useless. Even if Luo Yue declared war, as long as they could stall Luo Yue for two days, they would lose.
Luo Yue didn't have the power and storage to hold a long-term war. If they were stalled, the world Union army wouldn't take long to arrive to the Indian Ocean. But looking at the letters, the President knew his idea wasn't plausible and Luo Yue seemed to know this. Hence, they had declared war now and began to fight.
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Huang Yinian led Luo Yue's fleet into the Indian Ocean like no one was there.
The US wanted to fight back immediately, but they couldn't. Also, even if they did, they had to wait for the approval of the Union. Although Luo Yue's declaration of war wasn't in accordance with the code of peace, they had their reasons - despite them being very ridiculous.