The Russian rouble is expected to weaken to 100 against the U.S. dollar in the next 12 months, a 20% decline from its current level, according to a Reuters poll of 14 analysts on Friday, with potential new U.S. sanctions viewed as a major factor influencing the currency. U.S. President Donald Trump has said he will impose new sanctions on Moscow and countries that buy its energy exports - of which the biggest are China and India - unless Russia shows progress by August 8 towards a peace settlement in Ukraine.