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Russia said on Thursday it was working with both Armenia and Azerbaijan in its role as a security guarantor in the south Caucasus, after Armenia said Azerbaijan was concentrating forces near the border between the two countries, Reuters reported.

At a cabinet meeting on Thursday, Armenian Prime Minister Nikol Pashinyan said Azerbaijan was conducting an "ongoing military buildup along the line of contact in Nagorno-Karabakh and the Armenia-Azerbaijan border".

Asked about Pashinyan's comments, Kremlin spokesman Dmitry Peskov said Armenia's plan - announced on Wednesday - to host a joint exercise involving 85 U.S. soldiers next week was unhelpful.

"In this situation, holding such exercises does not contribute to stabilising the situation in any case and strengthening the atmosphere of mutual trust in the region," Peskov said.

"But Russia continues to fulfil its functions as a guarantor of security, Russia continues scrupulous, consistent and constructive work with both Yerevan and Baku," he added.