No progress has been made on a possible meeting between the Russian and US presidents, Vladimir Putin and Donald Trump, acting presidential aide Yury Ushakov said on Friday. “This matter stopped at a point that was reached in Trump’s telephone conversation with our leader on March 20, when the American side said a contact between the two presidents was possible,” TASS quoted Ushakov as saying. Ushakov refused to comment on Putin’s possible meeting with North Korea’s leader Kim Jong-un.