Ukraine has accused Russia of bringing three tanks into the east of the country to fight the Ukrainian army.
Interior Minister Arseny Avakov suggested separatist rebels had brought three tanks and other military vehicles across the border.
While he did not directly accuse Russia of sending the tanks, he made clear he held President Vladimir Putin responsible for failing to carry out a promise to tighten controls at the border.
More top news
Chung Mong-joon, the Fifa presidential candidate, has claimed he is facing suspension from the organisation's ethics committee.
Stunning drone footage has captured the beautiful moment two whales swim up to a paddleboarder off the coast of Australia.
The wife and children of Robin Williams have reached a settlement after a court battle over the late Oscar-winning actor's estate.