President Vladimir Putin said Thursday that Russian forces have effectively seized control of the key port city of Mariupol as they launch a renewed offensive in eastern Ukraine, while calling off plans to storm a steel plant where thousands of people remained holed up.U.S. President Joe Biden, however, told reporters Thursday there is no evidence yet that the Ukrainian city, which has been contested for weeks, has completely fallen. He also announced additional military assistance to Ukraine worth up to $800 million.In the latest move to further punish Russia for its aggression, Russian-af…READ FULL ARTICLE