HELSINKI, June 27 (RIA Novosti) - Russia has revoked its signature on a border treaty with Estonia, said Russian Foreign Minister Sergei Lavrov. "As the Estonian side has failed to fulfill its commitments, we are revoking our signature on the treaty," Lavrov said. There will be no ratification since there will be no agreement itself, the minister said. "We need to start new negotiations to settle the border issues," Lavrov added.