Preparations for a potential Russian-US summit is among the issues brought up by US National Security Adviser John Bolton at his current meetings in Moscow, White House Press Secretary Sarah Sanders confirmed. Kremlin intends to hash over Russia-US ties, global issues with Trump adviserhttps://t.co/qMHX8HvTwC© Vladimir Gerdo/TASS pic.twitter.com/01CHgHQHeA — TASS (@tassagency_en) June 27, 2018 “While in…