DNIPRO, Ukraine—Ukraine’s President Volodymyr Zelensky urged European countries to respond to an “energy attack” from Russia, after it indefinitely suspended natural-gas flows to the continent through a vital pipeline.
The move was the latest escalation in an economic war that is set to come to a head this winter as cold temperatures increase demand for energy. On the battlefield, Russian and Ukrainian forces are also digging in for winter, seeking to gain territory and secure positions before bad weather makes maneuvering harder and complicates operations for soldiers.