G7 leaders warn Russia of fresh sanctions over Ukraine --- Leaders of the G7 industrial nations meeting in Brussels say they are prepared to impose further sanctions on Russia over its actions in Ukraine. -- A joint statement condemned Moscow for its "continuing violation" of Ukraine's sovereignty. -- The summit is the first since Russia was expelled from the G7 following its annexation of Crimea in March. -- Earlier in Poland, US President Barack Obama warned Moscow against what he called its "dark tactics" in Ukraine. -- Mr Obama is on a three-state European tour ending with the 70th anniversary of the D-Day landings in France on Friday. -- Russian President Vladimir Putin will also be at the ceremony. -- Although President Putin is not attending the Brussels summit, he will hold face-to-face talks with some G7 leaders - not including President Obama - in Paris afterwards. -- The BBC's Chris Morris in Brussels says diplomacy has intensified to try to resolve the biggest crisis in years between Russia and the West. --- G7 leaders gathered in Brussels on Wednesday evening for the summit's opening dinner. -- "We are united in condemning the Russian Federation's continuing violation of the sovereignty and territorial integrity of Ukraine," the leaders said in a joint statement. -- "We stand ready to intensify targeted sanctions and to consider meaningful additional restrictive measures to impose further costs on Russia should events so require." -- German Chancellor Angela Merkel told reporters: "We can't afford a further destabilisation of Ukraine." -- "We have made clear that we want to continue with our three-step approach - support Ukraine in economic issues, talks with Russia, and should there no progress on all those issues... the possibility of sanctions, tougher sanctions, remains on the table," she said. - More, BBC, http://www.bbc.com/news/world-europe-27707518