Bolivia, the linchpin of gas supplies to the southern half of Latin America, is struggling to secure long-term investment for its hydro­carbons sector amid questions over its reliability as a supplier and uncertainty over demand from export markets.

Evo Morales, the country’s popular leftist president who faces a presidential election in December, travelled to Russia this week to sign an agreement with Gazprom, the state gas monopoly, to develop Bolivia’s gas reserves until 2030.