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 CardinBenjamin (Ben) Louis CardinOvernight Cybersecurity: Equifax CEO faces outraged lawmakers | Dem presses voting machine makers on cyber defense | Yahoo says 3 billion accounts affected by 2013 breach Key Dem: Did Kushner use private emails to talk with foreign governments? Dem senator pitches ideas for gun control after shooting MORE (D-Md.) and Rob PortmanRobert (Rob) Jones PortmanOvernight Cybersecurity: Equifax security employee left after breach | Lawmakers float bill to reform warrantless surveillance | Intel leaders keeping collusion probe open Reddit hires first lobbyists Senate panel approves bill compelling researchers to ‘hack’ DHS 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."