Ukraine has intensified missile and drone strikes on Russia. Russian air defenses are stretched, prompting efforts to find other approaches to protect domestic targets.

Ukrainian President Volodymyr Zelenskyy warned allies that the defense of his nation is a litmus test for broader Western resolve.

Ukraine said on Friday it had struck a Russian oil refinery and a microchip factory in a huge drone attack that caused fires at the refinery's production facilities and an oil pumping station. Russia said hours earlier that its forces had repelled an overnight drone attack,

Ukraine's drone attack on a critical Russian oil refinery intensifies the conflict's energy infrastructure warfare component, while Trump calls for OPEC to lower oil prices to end the war.

An elderly woman leaves her damaged home after missile attack in Zaporizhzhia, Ukraine, Thursday, Jan. 23, 2025.