MY COMMENTS IN CAPS:
I also favor peace and USA non-interference in foreign conflicts. Unfortunately, Trump did not end a single conflict, in which the USA was engaged - after hiring Neocon staff - and he escalated with Russia in Ukraine as POTUS - consistently. YOU SEEM TO IGNORE THE FACT THAT THE EU WAS EFFECTIVELY EXPANDING EAST FOR YEARS.
Obama** refused to send lethal-aid to Ukraine, but Trump did, and has bragged how what he sent was used to kill Russians.
TRUMP ALLOWED A FEW (DEFENSIVE) JAVELINS WHICH WERE ONLY USED AFTER RUSSIA INVADED.
Trump also withdrew from the INF Treaty on medium-range nuke-capable missiles, which would have been placed in Ukraine, within striking-distance of Moscow. He also withdrew from the "open skies" treaty. Dismantling these firewalls to war was "short-sighted," to use a polite term. US AND NATO AGREED THAT RUSSIA HAD BROKEN THE TREATY WITH DEPLOYMENT OF THE 9M7W9 CRUISE MISSILE
https://www.bbc.com/news/world-us-canada-49198565
Trump never ordered Ukraine to follow the Minsk Agreements, in exchange for receiving aid, which would have prevented the war. Neither did co-signatories Macron or Merkel - with Merkel admitting later, it was just a ruse to buy time to build up Ukraine's army for war.
AS ABOVE, BEFORE THE WAR, US AID WAS MINIMAL. THE MINSK AGREEMENTS (2014) DID NOT ADDRESS THE ROOT CAUSE OF THE PROBLEM, THEY WERE OF POOR TECHNICAL CONTENT AND FAILED TO DIRECTLY INCLUDE AND OBLIGATE RUSSIA. THERE WERE TOO MANY DISPUTES FROM BOTH SIDES FOR MORE THAN 2 YEARS BEFORE TRUMP TOOK OFFICE. HOW COULD TRUMP "ORDER" ANY NATION TO FOLLOW ANY AGREEMENT ALREADY IN PIECES????
Trump increased sanctions on Russia, including blocking the Nord-Stream II pipeline. That economic bridge to Europe was beneficial to maintaining a reason for peace, as well as keeping energy costs low in Europe (to spite their idiotic "green" energy-policy), to facilitate their (now wrecked) manufacturing base. THERE WERE EU COUNTRIES FOR AND AGAINST THIS.
** To be fair, the Coup of 2014 with the CIA and Gloria Nuland (Neocon Team I.S.W. / Kagan) was under Obama's watch - I am not a fan. But he did correctly state that Russia had "escalatory dominance" in Ukraine - why he refused to send lethal-aid - a perspective which has been proven correct. They also had 'surge capacity' for war-production, which we did/do not. TROUBLE WITH THAT IS THAT INITIAL WEAKNESS THAT UKRAINE WAS LEFT EVEN MORE VULNERABLE .... AND THE REST IS HISTORY.
OH, AND RUSSSIA DID NOT INVADE UA UNTIL BIDEN WAS POTUS. THE DONBAS AND CRIMEA OCCUPATIONS WERE UNDER OBAMA.