Russia fired a wave of drones and missiles at Ukraine overnight, killing at least four people, Ukrainian officials said on Sunday.

The strikes came a day before Ukraine’s allies were set to meet in Paris for talks on pressuring Russia to end its more than four-year war.

Ukraine’s air defences have come under strain from repeated Russian ballistic missile strikes in recent weeks.

The United States this week gave Ukraine permission to build US-designed Patriot air defence systems capable of downing Russian ballistic missiles, but it may be months before they enter production.

Three people were killed in Russian attacks on Ukraine’s central Dnipropetrovsk region overnight, including two in a strike on an “industrial enterprise” in the city of Kryvyi Rig, regional officials said.

A separate drone attack on the southern city of Kherson killed a 48-year-old, mayor Yaroslav Shanko reported.