Most Rev Justin Welby is due to attend a formal meeting on Tuesday with Russian Orthodox Church leader His Holiness Kirill, Patriarch of Moscow and All Russia.
The gathering follows the attendance of Patriarch Kirill to a private reception at Archbishop Justin's official residence in October 2016 (pictured above).
He will also visit the multi-national English-speaking congregation at the 19th century Anglican Church of St Andrew in Moscow.
St Andrew's recently welcomed a new chaplain, Rev Malcolm Rogers, whom Archbishop Justin will introduce to Patriarch Kirill the Archbishop's representative - or Apokrisiarios - to the Russian Orthodox Church.
During the visit, the Archbishop will also meet senior Russian political figures and give an address at the residence of the British Ambassador to the Russian Federation, Dr Laurie Bristow CMG.