Ukrainian Prime Minister Arseny Yatseniuk has said that Russian President Vladimir Putin's goal is to destroy Ukraine as an independent country and to restore the Soviet Union
Speaking at a conference in Kiev attended by European and Ukrainian lawmakers and business leaders, Mr Yatseniuk also praised a new wave of economic sanctions imposed on Russia by the European Union and the United States.
He said that they posed a major threat to the Russian economy.
Meanwhile, Ukraine's defence spokesman Andriy Lysenko said that Russian cargo moved across Ukrainian border "illegally", unchecked by the country's officials.
Last night in violation of established procedure of border and customs registration and without representatives of International Committee of Red Cross, the Russian side illegally moved the so-called humanitarian cargo over Donetsk border post in the Russian Federation and Izvaryne border post in Ukraine.
Ukrainian border officers and customs officers were not allowed to check and register cargo and vehicles.
Red Cross representatives are not accompanying cargo and its content is unknown, the security spokesman said.
More than half the vehicles of a Russian humanitarian aid convoy have arrived in the eastern Ukrainian city of Luhansk.
News agency RIA Novosti said that 100 lorries arrived on Saturday morning, with around 100 more lorries expected to reach the city during the course of the day.
The convoy, the second sent by Russia to the rebel-held city, contains 1,880 tonnes of aid including canned food, sugar, flour and diesel generators.
In August, Ukraine and its Western allies denounced the arrival of a first huge convoy that crossed the border without Kiev's permission.
Mr Lysenko also commented on the general situation in eastern Ukraine, where a week-old ceasefire has largely held, despite sporadic violations.
A ceasefire negotiated by envoys from Ukraine, Russia, the separatists and Europe's OSCE security watchdog, has been in place in eastern Ukraine since 5 September.
It is broadly holding despite regular but sporadic violations, especially in key flash points such as Donetsk.
