Former Secretary of State Madeleine Albright is in Ukraine, leading the National Democratic Institute's election observation mission.

Albright tweeted a picture from a polling station Sunday morning.

Ukraine, which has been engulfed in turmoil with Russia, is holding presidential elections Sunday after ousted President Viktor Yanukovych fled to Russia amid protests in the country.

High turnout is reported at polling stations in Ukraine.

"These are extremely important elections. We have to make sure Ukraine becomes a truly independent country, a powerful independent state that nobody will be able to push around," pensioner Mihailo Belyk, 65, told Reuters as he voted in a southeastern district of the Kiev.

A delegation of lawmakers including Sens. Ben CardinBen CardinWorries mount about vacancies in Trump's State Department Pence marks Armed Forces Day with vow to rebuild military Trump's steps on Iran show cooperation with Congress is possible MORE (D-Md.) and Rob PortmanRob PortmanGOP senators bristle at Trump's Medicaid cuts Overnight Energy: Trump budget takes flak over oil provisions GOP senators knock Trump's budget proposal MORE (R-Ohio) is also in Ukraine to help monitor the vote.

Portman tweeted that more than 100 Ukrainians "gave their lives fighting for a free & democratic Ukraine." "Their spirit lives on" through the election, he added.

Cardin tweeted that Russia "has violated just about every agreement they've entered," adding that observers were hoping to see a "free and fair election."