Transatlantic military alliance, NATO, has said that Russia's invasion of Ukraine has been a 'failure.'

According to Nato's secretary general, Jens Stoltenberg, Russia's war in Ukraine is not going according to plan and that its attempt to capture the eastern Donbas region has "stalled".

He also suggested Ukraine could win the conflict.

"Russia's war in Ukraine is not going as Moscow had planned," said Stoltenberg speaking at a meeting of Nato foreign ministerson Sunday, May 15.

Russia's President Vladimir Putin sees Nato as a security threat to Russia and invaded Ukraine in a bid to stop it from joining Nato.