LAKE SELIGER, Russia/KIEV, Dhu-AlQa'dah 3, 1435, Aug 29, 2014, SPA -- Ukraine called on Friday for full membership in NATO, its strongest plea yet for Western military help, after accusing Russia of sending in armoured columns that have driven back its forces on behalf of pro-Moscow rebels, Reuters reported. Russian President Vladimir Putin, defiant as ever, compared Kiev's drive to regain control of its rebellious eastern cities to the Nazi invasion of the Soviet Union in World War Two. He announced that rebels had succeeded in halting it, and proposed that they now permit surrounded Ukrainian troops to retreat. Speaking to young people at a summer camp, Putin told his countrymen they must be "ready to repel any aggression towards Russia." He described Ukrainians and Russians as "practically one people," language that Ukrainians say dismisses the very existence of their thousand-year-old nation. The past 72 hours have seen pro-Russian rebels suddenly open a new front and push Ukrainian troops out of a key town in strategic coastal territory along the Sea of Azov. Kiev and Western countries say the reversal was the result of the arrival of armoured columns of Russian troops, sent by Putin to prop up a rebellion that would otherwise have been near collapse. Rebels said they would accept Putin's proposal to allow Kiev forces, who they say are surrounded, to retreat, provided the government forces turn over weapons and armour. Kiev said that only proved that the fighters were doing Moscow's bidding. Russia drew a fresh rebuke from French Foreign Minister Laurent Fabius, who told French television station France 24 that Russia could face more sanctions from the European Union. -- SPA 21:36 LOCAL TIME 18:36 GMT www.spa.gov.sa/1267120