French President Emmanuel Macron told ABC News' George Stephanopoulos that he believes a negotiation is still "possible" with Russian leader Vladimir Putin to end Russia's invasion of Ukraine -- which Macron called a "huge mistake."In the interview, Macron talked about his visit to Washington and reinforcing France as the oldest ally of the U.S., especially during the war between Russia and Ukraine.During Macron's U.S. visit, he and Biden plan to address issues including economic ties between the two counties, challenges from China, Iran and the Middle East and aligning how to best support Ukraine against Russia, according to the White House."I think President Putin made a huge mistake by launching this war,” Macron told Stephanopoulos, mentioning the Minsk agreements made between Ukraine and Russia after 2014 in an effort to prevent war.“[Putin] is in charge and he's been in charge for quite a long time … He knows his people."