Arsen Avakov, the Ukrainian interior minister, said that Ukraine will not allow the Russian convoy of over 250 trucks to cross its border.
Announcing the sanctions, President Obama said that Russia was "isolating itself from the international community."
Igor Strelkov, a former war reenactor, is leading the separatist movement in Ukraine.
Tougher sanctions against Russia are necessary, no matter their effect on the economy, German Finance Minister Wolfgang Schaeuble says.
Russia's Navy is rehearsing for its annual Navy Day in Crimea, sans its former partner Ukraine.
Thursday is the second day of the airlift, which is transporting bodies of victims from Flight MH17 to the Netherlands.
Russia's increasing engagement with China does not mean Moscow can look east to avoid the pain of sanctions from the West.
President Vladimir Putin said on Tuesday Russia would try to ensure Ukrainian separatists cooperate with an investigation into the downing of a Malaysian airliner, but said the West must do more to persuade Kiev to end hostilities.
Experts say a surface-to-air missile most likely brought down MH17.
France's $1.6 billion warship deal with Russia is safe for now, but a third round of sanctions over Ukraine could put a hold on the sale.
The Dutch government has consistently refused to take a hard line over Moscow. Will that change with almost 200 of its people dead?
Despite accusations of complicity in the disaster, Russian President Vladimir Putin called Malaysia's prime minister.
The former U.S. Secretary of State also called on the European Union to join the U.S. in taking a tougher stand against Moscow.
On the first day of his Latin America tour, the Russian president canceled 90 percent of Cuba's debt to his country.
One U.S. film will compete in the Odessa International Film Festival, which features movies from many nations, including Ukraine and Russia.
A new measure requiring websites to store user data on Russian servers has again raised fears of Internet censorship in the country.
The outgoing head of NATO claims Russian operatives are secretly behind the anti-fracking movement sweeping Europe.
Ukrainian officials claimed that 300 pro-Moscow separatists were reported killed in clashes in the country's restive east.
Ukraine's president has announced plans to implement a unilateral cease-fire.
The Russian gas giant says the upfront money in the $400 billion deal will help build the "Power of Siberia" pipeline.
Violence heated up in Ukraine after Petro Poroshenko was is elected president. And in Donetsk, leader Pushilin claimed his bus was blown up.
The direct talks between the leaders are the first since the Ukrainian crisis erupted.