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After repeated denials, Saudi Arabia finally admitted the 59-year-old had been murdered at the mission in a "rogue" operation.
President Donald Trump has dramatically increased pressure on Tehran, withdrawing from an international agreement aimed at ending its nuclear programme.
Defence Minister Sergei Shoigu on Tuesday lauded National Security Adviser John Bolton for his two-day visit.
Bolton arrived in Russia Sunday and is set to speak with Russian Foreign Minister Sergei Lavrov.
Bolton have made a good start to the season and are eighth in the standings with 11 points from their opening six games.
Bolton, speaking before a new round of sanctions announced by the State Department took effect, set out what he cast as a tough approach by the administration to sanctions.
Bolton's meeting with Russia's security council secretary Nikolai Patrushev in Geneva was a follow up to last month's Helsinki summit between President Donald Trump and Russian leader Vladimir Putin.
The time and place of this summit will be announced tomorrow simultaneously by the Kremlin and the White House, US National Security Adviser John Bolton told reporters.
John Bolton's Moscow visit had been announced by the White House last week to discuss and plan a meet between Donald Trump and Vladimir Putin.
Bolton's visit to Moscow had been announced by the White House last week which said the two would explore the idea of a meeting between the US and Russian presidents.
On June 10, Putin said he was ready to meet his US counterpart as soon as Washington was ready, adding Vienna could be a possible venue for such a summit.
Fred Fleitz, who joined the National Security Council this week, was an outspoken opponent of the Iran nuclear deal when he worked at the Centre for Security Policy.
President Donald Trump is sending a high-level delegation to Jerusalem for the occasion.
US President Donald Trump has made no decision on Iranian nuclear deal: Security advisor John Bolton
Iran agreed to freeze its nuclear program in return for the lifting of international sanctions, but Trump has criticised the deal as not going far enough.
Libya's move to scrap its nuclear program also serves as a model of what North Korea fears will happen: its government was later overthrown by rebel forces supported by Western air strikes.