MOSCOW (Reuters) - The Kremlin said on Friday that a meeting between Russian President Vladimir Putin and U.S. President Donald Trump was essential but required considerable advance preparation and had to yield results when it happened.

ISTANBUL − Russia's Vladimir Putin spurned a challenge to meet face-to-face with Volodymyr Zelenskyy in Turkey, instead sending a second-tier delegation to planned peace talks, while Ukraine's president said his defence minister would head up Kyiv's team.