Russia mounts surprise assault on northern Ukraine in most serious cross-border offensive in two years

Russian forces have made two cross-border assaults inside northern Ukraine, according to information from Ukrainian sources and officials, in what President Volodymyr Zelensky is calling a “new wave of counteroffensive actions” by Russia.

In the first development, Russian soldiers penetrated at least one kilometer towards the town of Vovchansk, a Ukrainian military source told CNN. The aim, the source said, “was to get 10 km deep and create a buffer zone at the border to secure Russian territory from feeling the war.”

In an official statement, Ukraine’s Defense Ministry said Russian soldiers supported by...