Explosion, fire reported at Russia's oil refinery in Rostov region.

The remarks came as European officials continue debating future engagement with Moscow amid growing uncertainty over the United States' efforts to end Russia's war against Ukraine.

In the latest episode of Ukraine This Week, Anna Belokur examines how Volodymyr Zelensky’s presidency has changed over seven years in office, and whether he still represents the anti-establishment promises he campaigned on in 2019.

A large-scale drone attack targeted the Moscow region overnight on May 16–17, with Russian officials and local residents reporting multiple explosions across the area.

Russia launched 287 attack drones overnight, Ukraine’s Air Force said, adding that 279 drones were shot down or suppressed by air defenses. Eight drones struck seven locations.

The number includes 1,170 casualties that Russian forces suffered over the past day.

Ukrainian tennis player Elina Svitolina won the WTA 1000 Internazionali BNL d’Italia tournament in Rome, securing one of the biggest titles of her recent career.

Romania's Defense Ministry said that an "unguided reactive projectile" was discovered on a property near the country's border with Ukraine.

The waiver, which allowed purchases of Russian oil stranded at sea, has expired as of 12:01 a.m. Eastern Daylight Time on May 16.

"Probably they need more people to send to the war in Ukraine," Moldovan President Maia Sandu said.

"We discussed strengthening our capabilities to repel Russian attacks right now," President Volodymyr Zelensky said.