Leaders of the G7 industrial nations are meeting in Brussels, with the Ukraine crisis set to dominate talks. It is their first meeting since Russia was removed from the club following its annexation of Crimea in March. In a joint statement, G7 leaders said they are prepared to impose further sanctions on Russia over its interference in Ukraine. Earlier in Poland, US President Barack Obama warned Moscow against what he called its dark tactics in Ukraine. He also met Ukraine President-elect Petro Poroshenko, and pledged support for plans to restore peace to the country.Earlier, the UK Prime Minister David Cameron said he expects the G7 to send a clear message of support for Ukraine, as well as calling for Russia to seek a diplomatic solution to the crisis.German Chancellor Angela Merkel said," 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".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. The two leaders have no meeting scheduled but Mr Putin said he was ready for dialogue.