Czech Defence Minister Martin Stropnicky said it was hard to imagine that Russian firms could take part in the planned expansion of a Czech nuclear power plant after developments in Crimea, according to Reuters.
"Russia has disappeared from the group of predictable, democratic countries. What it is doing is unacceptable", Stropnicky said.
A consortium including Russia's Atomstroyexport is bidding for a contract worth over $10 billion to expand the Temelin plant, alongside Toshiba's U.S. unit Westinghouse. It is anyway not clear that the project will go ahead because of low electricity prices in Europe.
Pro-Russia activists recaptured administrative headquarters in the Ukrainian city of Donetsk and flew the Russian flag from its roof.
ITV News' Europe Correspondent describes the tense atmosphere surrounds a central government building in Donetsk .
New footage obtained by ITV News shows Russian troops firing warning shots as Ukrainian soldiers approached during a tense stand-off today.