You asked about promises. Obviously, a promise isn’t a treaty.
And, yes, 0bama DID send arms to the Ukraine. Trump sent more.
Merkel DID sign the Minsk Agreement. There is no “deceptive” editing.
Are you an SBU troll?
No, Obama sent only non-lethal military aid.
Merkel DID sign the Minsk Agreement
Easy enough to verify. Signers of Minsk 2 Agreement: Separatist's leaders Alexander Zakharchenko and Igor Plotnitsky, Swiss diplomat and OSCE representative Heidi Tagliavini, Former president of Ukraine and Ukrainian representative Leonid Kuchma, Russian Ambassador to Ukraine and Russian representative Mikhail Zurabov
While the Trump administration was the first willing to provide lethal weapons to Ukraine, the Obama administration did provide defense and military equipment.
https://www.cnn.com/2022/03/16/politics/us-ukraine-aid-fact-check/index.html
https://en.wikipedia.org/wiki/Minsk_agreements