UNITED NATIONS — Europe alone is not responsible for helping Ukraine bring an end to its war with Russia, EU top diplomat Kaja Kallas warned Thursday. That is particularly true when considering President Donald Trump’s pledge to halt the fighting, she said in an interview on the sidelines of the U.N. General Assembly. “He was the one who promised to stop the killing,” Kallas said. “So it can’t be on us.” Her comments come as Ukraine and its allies try to divine the meaning of Trump’s sudden about-face on the war between Kyiv and Moscow. In a Truth Social post...