President Trump lashed out at Ukrainian President Volodymyr Zelenskyy again on social media, after the Ukrainian leader refused to accept Russia's 2014 annexation of Crimea.
Ukraine said it would reciprocate any genuine ceasefire by Moscow, but voiced skepticism after Russian President Vladimir Putin announced a temporary Easter truce in Ukraine starting Saturday.
Secretary of State Marco Rubio said Friday that the U.S. would walk away from efforts to broker a ceasefire between Russia and Ukraine if progress isn't made within days.
The war in Ukraine is now largely being fought with drones. Ukraine made 2 million last year. Drone makers churn them out in factories and mom-and-pop operations like one in a Kyiv basement apartment.
The White House says it has secured an agreement with Russia and Ukraine on the Black Sea, to ensure safe navigation, eliminate the use of force and prevent the military use of commercial vessels.
The closed-door talks at the Ritz-Carlton Hotel in Riyadh follow U.S. consultations with a Ukrainian delegation on stabilizing the front lines and implementing a proposed 30-day armistice.
The number of troops that would help enforce a peace in Ukraine is vague. Officials have cited figures of between 10,000 and 30,000 troops as part of what's been termed a "reassurance force."