New Delhi, Sept. 4 -- Russian aerial attacks overnight and during daylight Wednesday killed two civilians and wounded six in the central Ukrainian city of Dnipro, local officials said, while the Kyiv and Odesa regions bore the brunt of Moscow's latest strikes.

The air war between Russia and Ukraine has intensified as the conflict stretches into its fifth year following Moscow's invasion of its neighbor. The front line in eastern and southern Ukraine remains largely deadlocked, and U.S. efforts to negotiate a settlement have yet to produce a path to peace.

Russian President Vladimir Putin and Ukrainian President Volodymyr Zelenskyy exchanged threats late Tuesday over what their next steps might be.

Zelenskyy warned foreign airlines that...