Throw in the Treaty of Portsmouth [NH] (the second one, in 1905).
Some have argued that it sowed the seeds of WWI, not to mention an expansionist Japan. (Korea was annexed shortly after that war.)
Of course, Czar Nicholas II & Co. pushed Japan into starting the Russo-Japanese war, thinking Japan wasn’t going to stand up to Russia grabbing an ice-free Pacific port...all but bankrupting both countries, causing social unrest for each of the two empires.
Any way, Roosevelt appeared to have sided with Russia, causing friction with Japan, and upsetting the British Empire’s Far East trade as well, now having to deal with Japanese trade competition.
But hey, Roosevelt got the Nobel Peace Prize.
Some have argued that it sowed the seeds of WWI,
That is laughable ! I studied European history in college and during that time all the major countries in Europe went on a Huge military buildup while forming secrete alliances. These guys were spoiling for a fight, and Any excuse would start it.
Think about it. A Serbian terrorist throws a bomb into a car that kills The Arch Duke and his wife started that Damn War!