Turkish Vice President Fuat Oktay said on Monday that US House Speaker Nancy Pelosi's "biased" statements regarding the clashes between Armenia and Azerbaijan "sabotage diplomacy efforts" and were unacceptable, Reuters reported.

Pelosi visited Armenia this weekend, in an unprecedented show of US support for the country, which has for over three decades been locked in conflict with its neighbor Azerbaijan over Nagorno-Karabakh.

On Twitter, Oktay also called on Washington to clarify whether Pelosi's statements reflect the official US position.