U.S. President Barack Obama speaks by phone with Netherlands Prime Minister Mark Rutte and they both agree on the need to impose more sanctions on Russia for continuing to arm pro-Russian separatists in Ukraine.
Russia warns the United Kingdom that it will bomb British vessels if any further provocative action is taken by the British Royal Navy in the Black Sea. Russia had previously summoned the British ambassador to Russia over this week's incident. The UK says that the vessel was in Ukrainian waters, that it was entirely right to use the route, and that the Royal Navy will always uphold international law and will not accept unlawful interference with innocent passage.
Ukrainian ecology minister Ostap Semerak warns of a major nuclear disaster if pro-Russia separatists go forward with a plan to flood a mine where a small nuclear weapon was tested in the 1970s. Semerak appeals for international assistance to prevent the flooding.
The United States imposes sanctions on twelve Russian owned companies, a Russian arms exporter, and a bank. The U.S. cites multiple reasons, including Russian meddling in the 2016 elections and military engagements in Ukraine, Crimea, and Syria, among others.
US President Barack Obama warns Russia, saying that any violation of Ukraine's sovereignty and territorial integrity would be "deeply destabilizing," and that "the United States will stand with the international community in affirming that there will be costs for any military intervention in Ukraine."