FILE PHOTO: Former Director of National Intelligence James Clapper testifies about potential Russian interference in the presidential election before the Senate Judiciary Committee on Capitol Hill, Washington, D.C., U.S.

U.S. National Security Adviser John Bolton adjusts glasses during a news briefing following his meetings with Georgian officials in Tbilisi, Georgia October 26, 2018. REUTERS/David Mdzinarishvili

TBILISI (Reuters) - The United States will do what it deems necessary, including considering more sanctions, to address Russia’s interference in its elections and its annexation of Ukraine’s Crimea, U.S.

U.S. National Security Adviser John Bolton speaks during a news briefing following his meetings with Georgian officials in Tbilisi, Georgia October 26, 2018. REUTERS/David Mdzinarishvili

TBILISI (Reuters) - U.S.

U.S. National Security Adviser John Bolton adjusts glasses during a news briefing following his meetings with Georgian officials in Tbilisi, Georgia October 26, 2018. REUTERS/David Mdzinarishvili

TBILISI (Reuters) - U.S.

ELKO, Nev/MOSCOW (Reuters) - President Donald Trump said Washington would withdraw from a landmark Cold War-era treaty that eliminated nuclear missiles from Europe because Russia was violating the pact, triggering a warning of retaliatory measures from Moscow.

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