Actually, Zelensky waited until Trump left office in January; then he had a decree approved by his government in March (undoubtedly after consultations with the Biden administration...Nuland) which called for them to use all means necessary to defeat the Donbass and retake Crimea.
None of this would have ever happened had Trump been re-elected. As you can see in the video Trump expected him to resolve the problem with Putin.
Unfortunately, since the Obama/Putin administration’s goal was to use Ukraine to provoke Putin, destabilize and weaken Russia resulting in Putins’s removal Zelensky’s orders were changed from Trump’s instructions.
The rest is history.
The other side was always operating behind Trump’s back all four years. Obama and other RATs were violating that Hatch Act and were out there undermining and telling countries that Trump would soon be gone. The plotting was always going on.
Some in our military were purposely not following Trump’s orders and doing what they saw fit to do behind Trump’s back.
Sorry, that should read Obama/Biden administration (not Putin)...:-)