Ms Truss said the UK and EU were trying to ensure Western economies were less dependent on Russian energy.
The foreign secretary said the Nord Stream 2 gas pipeline between Germany and Russia would be "a problem" if Russia invaded Ukraine.
It would be an issue to discuss with her new German counterpart at the G7 talks.
Ms Truss said: "We absolutely need to reduce dependence on Russian gas and energy. And this should be part of an overall strategy of reducing dependence on non market economies, reducing dependence on malign actors, and making sure that the free world is able to have that strategic independence it needs to survive and thrive."
US President Joe Biden and Russian President Vladimir Putin on Tuesday held a
virtual summit aimed at reducing tensions in the region. Mr Biden said he had made it clear to Mr Putin that there would be "economic consequences like none he's ever seen" if he invaded Ukraine.