Suspected Gunman Said He Was Willing to Fight and Die in Ukraine

Ryan Wesley Routh, the 58-year-old man who was arrested on Sunday in connection with what the F.B.I. described as an attempted assassination on former President Donald J. Trump, had expressed the desire to fight and die in Ukraine.

Mr. Routh’s posts on the social media site X revealed a penchant for violent rhetoric in the weeks after Russia’s invasion of Ukraine in 2022. “I AM WILLING TO FLY TO KRAKOW AND GO TO THE BORDER OF UKRAINE TO VOLUNTEER AND FIGHT AND DIE,” he wrote.

On the messaging application Signal, Mr. Routh wrote that “Civilians must change this war and prevent future wars” as part of his profile bio. On WhatsApp, his bio read, “Each one of us must do our part daily in the smallest steps help support human rights, freedom and democracy; we each must help the chinese.”

Mr. Routh, a former roofing contractor from Greensboro, N.C., was interviewed by The New York Times in 2023 for an article about Americans volunteering to aid the war effort in Ukraine. Mr. Routh, who had no military experience, said he had traveled to the country after Russia’s invasion and wanted to recruit Afghan soldiers to fight there.

In a telephone interview with The New York Times in 2023, when Mr. Routh was in Washington, he spoke with the self-assuredness of a seasoned diplomat who thought his plans to support Ukraine’s war effort were sure to succeed. But he appeared to have little patience for anyone who got in his way. When an American foreign fighter seemed to talk down to him in a Facebook message he shared with The New York Times, Mr. Routh said, “he needs to be shot.”

In the interview, Mr. Routh said he was in Washington to meet with the U.S. Commission on Security and Cooperation in Europe, known as the Helsinki Commission “for