The president : Donald Trump
"The Constitution provides that the president "shall have Power, by and with the Advice and Consent of the Senate, to make Treaties, provided two-thirds of the Senators present concur" (Article II, section 2)."
https://www.senate.gov/artandhistory/history/common/briefing/Treaties.htm
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The helots were slaves and they were also mercenaries, so they fought for the Spartans, usually against Persia and Athens.
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The Russo-Japanese War developed out of the rivalry between Russia and Japan for dominance in Korea and Manchuria. In 1898 Russia had pressured China into granting it a lease for the strategically important port of Port Arthur (now Lüshun), at the tip of the Liaodong Peninsula, in southern Manchuria.
The soviets won the Space Race