President Donald Trump has made it clear that he wants a change of leadership in Ukraine, and the apparent American tampering with the embattled nation’s defenses raises the question of how far he is willing to go to get it.

Ukrainians awoke on Wednesday to find that their military had been restricted in its use of Starshield, the American satellite service undergirding swaths of the nation’s defensive infrastructure and weaponry. The restrictions emerged just days after Trump admonished Ukrainian President Volodymyr Zelensky in the press, calling on the leader to step down and hold wartime elections. The timing suggested that the United States was consciously undercutting an ostensible ally, pressuring Zelensky to step aside or risk catastrophic outcomes on the battlefield.