While Trump betrayed the Iranian, Israelis, and the Kurds in his first presidency, it was Trump who signed the sanctions on Russia's Nord Stream 2 that prevented the invasion from occurring much earlier. Biden lifted those illegally.
Biden also didn't provide enough weapons to beat Russia, but no one faulted him for this, or for lifting the sanctions. The only way Ukraine is 'liberated' is by the U.S. invading. But that would lead to a nuclear exchange with Russia just as it would have during the Cold War.
Trump betrayed the Ukrainians.
Trump betrayed the Iranians.
Trump betrayed the Israelis.