NPR's Michel Martin asks former U.S. National Security Advisor John Bolton about the prospects for security guarantees in Ukraine and what they might look like.

Following the meetings with Trump and Zelenskyy at the White House, European leaders have been urgently trying to figure out what they need to do next to end Russia's war in Ukraine.

Wildfires are tearing across Spain, killing several people and scorching nearly 1,500 square miles. This year's fire season is already among the country's worst on record.

Health departments struggle to adequately survey for ticks to warn doctors about new species and the diseases they carry.