Group of Seven (G7) leaders plan to tighten sanctions on Russia at their summit in Japan this week, with steps aimed at energy and exports aiding Moscow's war effort, officials with direct knowledge of the discussions have said.

New measures announced by the leaders during the meetings, which run from Friday to Sunday, will target sanctions evasion involving third countries, and seek to undermine Russia's future energy production and curb trade that supports Russia's military, the people said.

Separately, U.S. officials also expect G7 members will agree to adjust their approach to sanctions so that, at least for certain categories of goods, all exports are automatically banned unless they are on a list of approved items.