As it tries to demonstrate its continuing ability to fight, Ukraine said it had used drones to inflict serious damage on a Russian Kilo-class submarine at a Black Sea port.
The Ukrainian leader rejected the demand, making clear that territorial issues remain unresolved as Ukraine and Europe sent a counterproposal to the United States.
Russian forces have advanced on several fronts recently. President Vladimir V. Putin signaled after talks with U.S. officials that he was not budging from demands.
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