It’s become routine since Russia invaded Ukraine: President Joe Biden and Ukrainian President Volodymyr Zelenskyy speak by phone whenever the U.S. announces a new package of military assistance for Kyiv. But a phone call between the two leaders in June played out differently from previous ones, according to four people familiar with the call. Biden had barely finished telling Zelenskyy he’d just greenlighted another $1 billion in U.S. military assistance for Ukraine when Zelenskyy started listing all the additional help he needed and wasn’t getting. Biden lost his temper, the people familiar with the call said. The American people were...