Ukrainian President Volodymyr Zelenskyy has requested more ammunition for Patriot air defense systems from the U.S. to counter Russian missile attacks, highlighting Ukraine's dependence on Western allies. This appeal follows severe missile and drone strikes on Kyiv. An adviser confirmed the letter was sent to President Trump and Congress, while a senior official noted the difficulty in securing ammunition due to competing demands. The situation escalates as Russia threatens further attacks on Kyiv, with Secretary of State Marco Rubio expressing readiness to mediate the conflict.