Posts from Paradox or Riddle. Brain-training exercises. Auto-translated

Did one brother gain notoriety, and therefore another rejoiced for him? Well, well!

Someone wrote this brother's name in a death note, stating that he would commit suicide.

no

Did the brother become infamous? i.e., for doing something bad?

yes

Could someone who got on the train be mistaken for the brother?

no

Did your brother also die? :С

During the game, my brother became famous for infiltrating the Kremlin and blowing everything up. After reading about this, I simply had no choice and did the same... I kicked a log.

Rather, they were both potential suicide bombers, but the brother had already carried out the terrorist attack, while the one on the train was only planning to do so.

Yes, it seems to be true.

"There is room for it."

Did the brothers have a good relationship?
Did the brothers compete with each other in anything?

Added after 53 seconds
Was the famous brother dead at the time when the suicide committed suicide?

More likely, they were both potential suicide bombers, but one had already carried out the attack, while the one on the train was just planning to.

Exactly :D It's that simple, but you overcomplicated it.

Maybe I'll give you a more challenging puzzle later to identify someone with manic tendencies.

Mold is scheming! x)

Okay, I'll come up with something when I can.

Added 12 minutes later
Well, here's something like a riddle. But it's quite easy because I'm not good at making them up.

There are three kingdoms, let's call them Fus, Ro, and Da. The king of Fus wants to marry his daughter to the prince of Ro, but if he does, the kingdom of Da threatens to declare war. The kingdom of Da is more powerful than the kingdoms of Fus and Ro. What is the reason for this behavior of the kingdom of Da?

Is the ruler of the kingdom of Da in love with the daughter of King Fus?

No, but close.

King Fus has no other heirs, and after the wedding, in the event of his death, Fus and Ro will unite, becoming stronger, right?

No. But it's also a valid line of thought, to some extent.