奥巴马将于波兰举行安全会谈US President Barack Obama is due to hold talks in Poland - with the Ukraine crisi s likely to top the agenda.美国总统奥巴马将于波兰举行会谈——乌克兰危机可能成为首要议题。 Mr Obama is also expected to reiterate（重申） America's support for its Nato allies in Europe and keep up pressure on Russia over its role in the crisis. In April, the US sent 150 soldiers into Poland for military exercises amid growing tensions with Moscow. Mr Obama's meetings in Warsaw are part of a European tour which will also take him to Belgium and France. In Belgium, the US leader is expected to urge Western leaders to reaffirm their united position on Ukraine at a G7 meeting of major industrial nations. The summit had been initially planned in Russia, but Western leaders later decided to boycott it following Moscow's annexation of Crimea from Ukraine in March. In France, Mr Obama will take part in ceremonies to commemorate the 70th anniversary of the D-Day landings in Normandy. President Vladimir Putin is also invited, but the White House has already made it clear that the American and Russian leaders will not hold formal bilateral talks. Washington has repeatedly warned Moscow that it faces new sanctions if it refuses to de-escalate（逐步增强） tensions in eastern Ukraine, where fierce fighting has continued between separatists and Ukrainian government troops. On Monday, hundreds of rebels attacked a border command centre near the eastern Ukrainian city of Luhansk, The Kremlin denies Western claims that it is supporting the rebels.
