(QHA) -

Nato's military commander in Europe has issued a warning about the build-up of Russian forces on Ukraine's border, BBC reports.

Supreme Allied Commander Europe Gen Philip Breedlove said Nato was in particular concerned about the threat to Moldova's Transnistria region.

The region of Transnistria, a land west of Ukraine belonging to Moldova but claiming it is part of Russia, repeated earlier its long-standing request to join the Russian Federation.

NATO officials declared that the build-up of Russian troops constituted a threat to other post-Soviet states.

Russia said its forces east of Ukraine complied with international agreements

In Ukraine itself, the government raised fears that military phase of the conflict with Russia could be well under way. National secirity chief Andriy Parubiy was quoted by Al Jazeera as saying that "the aim of Putin is not Crimea but all of Ukraine" and that his troops at the eastern Ukrainian border "are ready to attack at any moment".