By Amir Mizroch

BARCELONA--Russia's most popular search engine Yandex NV (YNDX) said Wednesday that the crisis in eastern Ukraine has had a big impact on its business.

Speaking at Morgan Stanley's European Technology, Media and Telecoms conference here, Yandex Chief Financial Officer Greg Abovsky said the company was losing a lot of search queries from Ukraine.

"Ukraine is a pretty big chunk of our business in terms of clicks," Mr. Abovsky said. "It's very small in terms of revenue--some 2%--but in terms of clicks it's pretty substantial. Losing a ton of clicks in that part of the country has been certainly detrimental to the business."

The core Russian business of paid clicks and search continue to grow at a healthy pace, he added.

Mr. Abovsky said Yandex is losing market share in Turkey, which was a test bed of international expansion for the Russian company.

Yandex Chief Operating Officer Alexander Shlugin said the company had decided to "stand back a bit" on investments in advertising in Turkey compared to previous years and focus primarily on product quality. "But we will stay in this market," he added.

Mr. Abovsky said Yandex was having difficulty growing its business on Android mobile devices, and its market share on phones running Google Inc.'s (GOOG) mobile platform was falling.

"The problem on Android is that Google owns the platform. You can't show up as much as you maybe want to," he said.

To counter the difficulty, he said, Yandex is experimenting with the way its ads are seen on the Internet and on mobile platforms, as well as increasing the amount of ads shown on mobile phones, up to two or three per commercial query from only one, as is currently the case.

Write to Amir Mizroch at amir.mizroch@wsj.com

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