Cool story - The constitution designates the President as the responsible party for foreign relations. The USA has a treaty with Ukraine to investigate crimes mutually.
"A PRESIDENT IS IMPEACHABLE IF HE *ATTEMPTS TO *SUBVERT THE CONSTITUTION." - JAMES MADISON; *ATTEMPTS; *SUBVERT : VERB. UNDERMINE THE POWER AND AUTHORITY OF AN ESTABLISHED SYSTEM OR INSTITUTION; *ATTEMPT : VERB. MAKE AN EFFORT TO ACHIEVE OR COMPLETE SOMETHING, TYPICALLY A DIFFICULT TASK OR ACTION.