image from video taken by High Definition Earth Viewing (HDEV) experiment aboard the ISS
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Is politics risking space projects?

Collaboration between the US and Russia on the International Space Station (ISS) could be jeopardised as tensions between the two nations create political disputes.

Tensions between Russia and the United States have reached a new high since the downing of flight MH17 over Ukraine.

Sanctions have been put in place targeting Russia's finance, defence and energy sectors but the Russians may have found a way to hit back - through the space industry.

Science correspondent Rebecca Morelle reports.