President Petro Poroshenk

German historian Michael Pesek wrote an open letter to Ukraine's President Petro Poroshenko, in which he told the president not to get too cozy with the White House, warning him that being a close ally of the United States might not be the beginning of a long-lasting friendship, Sputnik news agency reported on Monday.
“You should be warned that this might not be the beginning of a long-living love affair that inevitably ends with an account full of dollars, an army equipped with the finest stuff ever produced to kill your enemies,” said Pesek, who teaches courses in history and political science at the University of Hamburg and Free University of Berlin.
Pesek went on to compare Poroshenko with other dictators, who were puppets of the United States in the past, but then became the enemies of the White House after the tides shifted in Washington.
In particular, the historian reminded Poroshenko of Saddam Hussein, who was Washington’s close ally in the Middle East during the 1980s.
However, after Cold War ended and the Americans changed their views on the Middle East, Hussein was useful as an enemy rather than as a friend.
The rest is history: the former dictator was captured sitting in a hole and soon hanged in the dark of the night.