Secretary of State John Kerry will be heading to Kyiv Monday for discussions there Tuesday, the U.S. top diplomat tweeted as Russia continued to assert increasing control over Ukraine’s Crimean peninsula.

“Secretary Kerry will meet with senior representatives of Ukraine’s new government, leaders of the Rada (Ukraine’s parliament), and members of civil society. The Secretary will reaffirm the United States’ strong support for Ukrainian sovereignty, independence, territorial integrity, and the right of the Ukrainian people to determine their own future, without outside interference or provocation,” says a statement by the U.S. State Department.

VOA