Ukraine accuses Russia of attack on president's website after web sanctions

The logo of Russian internet group Yandex is pictured at the company's office in Kiev, Ukraine May 16, 2017. REUTERS/Valentyn Ogirenko

KIEV (Reuters) - Ukraine accused Russia on Tuesday of carrying out an organised cyber attack on President Petro Poroshenko's website in response to Kiev's decision to impose sanctions against a number of major Russian internet businesses.

Earlier on Tuesday, Ukraine slapped economic restrictions on Russia's largest internet group Yandex and other popular online firms, saying it wanted to guard against cyber threats, and the Kremlin threatened retaliation.