Defiant Zelenskiy pledges powerful response to Russia on eve of war's six-month milestone

As Ukraine prepared to mark both its independence from Soviet-rule in 1991 and the six months since Russian troops invaded, President Volodymyr Zelenskiy pledged that any Russian attacks in or around the date would provoke a powerful response.

Zelenskiy, who has led his country's resistance since Russian troops poured over the border on Feb. 24, also said Ukraine would restore its rule over the Crimea region - annexed by Russia in 2014 in a precursor to this year's invasion.

Despite his defiance, there was concern among Ukrainian and allied Western...