Russia landed two nuclear-capable bombers in South Africa on a training mission on Wednesday, a flight apparently timed to coincide with President Vladimir Putin's opening of a flagship Russia-Africa summit designed to increase Russian influence.

The two Tupolev Tu-160 strategic bombers touched down at Waterkloof air force base in Tshwane on Wednesday, the South African National Defense Force said. Russia's Ministry of Defense has said the mission is designed to nurture military ties with South Africa.

Speaking before dozens of African heads of state at a two-day summit in the southern Russian city of Sochi, Putin called for trade with African countries to double over the next four to five years and said Moscow had written off African debts to the tune of over $20 billion.