Ukraine's foreign minister Pavlo Klimkin and United States Secretary of State Rex Tillerson met in Vienna to discuss all of Ukraine's main problems and U.S. help in solving them.

"I met with U.S. counterpart Rex Tillerson. We discussed everything: from our joint work on the UN peacekeeping mission in occupied Donbas to energy security to U.S. support for an efficient and independent anti-corruption system in Ukraine," Klimkin wrote on Twitter on Thursday.

The Organization for Security and Co-operation in Europe Ministerial Council is meeting in Vienna.