Inflation comes from increases in money, cash or its equivalent.
With the creation of new money that is going into Ukraine (like over $100 billion), since it is US money, it will filter back into the US in the form of inflation.
Whoever is causing money to be sent to Ukraine is causing the extra high inflation. It isn't all Biden's fault, but he is in there, right along with the rest of the supporters of Ukraine.
The point is that there are reasons why US money can fail. If it does, it will fail fast. Inflation from the war isn't helping.