KYIV, Ukraine — Russian drones battered the Ukrainian port city of Odesa and glide bombs hit Zaporizhzhia, local authorities said Tuesday, as the Kremlin again warned that negotiators are unlikely to obtain a swift breakthrough in peace talks on the war.

At least one was killed and 27 hurt in the latest atacks.

Ukrainian, British, French and U.S. officials are due to meet in London today to discuss the war. Anticipation is building over whether diplomatic efforts can stop more than three years of fighting since Russia’s full-scale invasion of its neighbor. Hostility has run deep since Russia invaded and illegally annexed Ukraine’s Crimean Peninsula in 2014.

Retired Lt. Gen. Keith Kellogg, President Donald Trump’s envoy for Ukraine and Russia, will represent Washington in peace discussions with Ukrainian and European officials this week in London, the U.S. State Department said Tuesday. Secretary of State Marco Rubio, who won’t attend, has suggested that the meeting could be decisive in determining whether the Trump administration continues its involvement.

— The Associated Press