NATO Secretary-General Jens Stoltenberg has denounced Russian military build-up both inside Ukraine and on the Russian side of the border.
He urged Moscow to pull back its troops.
Stoltenberg said NATO saw movement of troops, equipment, tanks, artillery and also of advanced air defense systems in violation of a ceasefire agreement.
A ceasefire was agreed in early September, but fighting flared again recently.
Russia denies providing arms or troops to support a separatist pro-Russian rebellion in eastern Ukraine, which began after the removal of a Kremlin-oriented Ukrainian president by mass protests in February.
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Source: Radio Pakistan