Poland said on Saturday it would summon Russia's envoy after he said Warsaw was partly to blame for the outbreak of World War Two, continuing a spat which has seen the Polish ambassador in Moscow summoned twice in just over a week.
Ukrainian President Petro Poroshenko signed a new military doctrine on Thursday naming Russia as the main military threat to Ukraine, according to a statement on the presidential website.
U.S. President Barack Obama believes that holding military talks with Russia on Syria is an important next step and hopes they will take place very shortly, Secretary of State John Kerry said on Friday.