evidence: UPDATE 2-Blinken says Ukraine has taken back 50% of territory that Russia seized (Adds quotes from Blinken, background in the final four paragraphs) [...] WASHINGTON, July 23 (Reuters) - U.S. Secretary of State Antony Blinken said that while Ukraine has recaptured half the territory that Russia initially seized in its invasion, Kyiv faced "a very hard fight" to win back more. [...] The United States has given Ukraine more than $41 billion in military aid since Russia invaded in February 2022. (Reporting by Kanishka Singh and Raphael Satter in Washington; Editing by Cynthia Osterman)