U.S. President Joe Biden speaks on the phone with Russia's President Vladimir Putin about a possible Russian invasion of Ukraine, as Biden spends the weekend at the U.S. presidential retreat at Camp David, in this official White House handout photo released after the call took place in Thurmont, Maryland, U.S., February 12, 2022. The White Acquire Licensing Rights Read more WASHINGTON, Aug 18 (Reuters) – U.S. President Joe Biden will sign a strategic partnership agreement with Vietnam during a state visit to the Southeast Asian country in mid-September, Politico reported on Friday, citing three people with knowledge of the deal's…