Warsaw said the volume of gas from Russia dropped by 45 percent, though Russia's Gazprom denied it had cut supplies.
Cooperation between the U.S. and Russia on space projects has been jeopardized over the latter's role in the conflict in eastern Ukraine.
There was bi-partisan support for confronting ISIS, but lawmakers had strong words for President Obama's foreign policy strategy.
The Bulava missile was fired from a Russian submarine near Finland and it hit a target near Japan.
Moscow denies sending troops into eastern Ukraine to support pro-Russian rebels battling Ukrainian forces.
Poroshenko also said a cease-fire between government forces and rebels in eastern Ukraine was proving difficult to maintain.
Groups on both sides of the conflict in eastern Ukraine have accused each other of anti-Semitism.
A dramatic swing in Scottish independence polls toward a "yes" vote has investors scrambling for answers on what might happen.
As loud and vocal as they may be, Nazis and nationalists in Ukraine make up a small minority contingent in Ukraine.
Many residents of the Black Sea port are staying put, despite signs that it may soon be the next front in the Ukrainian conflict.
The images of Ukraine's volunteers are particularly powerful in Germany, the birthplace of Nazism.
The EU, which approved fresh sanctions against Russia on Monday for inciting unrest in eastern Ukraine, has delayed implementing them.
The report from the Dutch Safety Board also ruled out technical faults and crew involvement in the plane's downing.
"I have ordered [the military] to secure the defense of Mariupol with howitzers, multiple rocket launchers, tanks, anti-tank weapons and air cover," Poroshenko told steel workers in the port on the Sea of Azov near the Russian border.
The new U.N. human rights chief urged world powers on Monday to protect women and minorities targeted by Islamic State militants in Iraq and Syria, saying the fighters were trying to create a "house of blood.
Russia has pledged to strike back, hinting at a ban of all EU flights over Russian territory.
Home Depot hasn't confirmed it's been hacked, but researchers think they've identified the suspects already.
The U.N. says the 298 victims of MH17 should count toward the total death toll in Ukraine.
EU had earlier said that new sanctions, targeting Russia's defense and oil companies, could be announced if the cease-fire fell through.
Under the radical $1.9 billion overhaul unveiled last week, MAS said it would shed nearly a third of its 20,000 workforce.
The German automaker said the decision was based on Russia's faltering economy.
"In some ways, we are solving a non-existent problem because we can't solve the existing ones," a Western defense official, speaking on condition of anonymity, said as the 28-nation summit ended on Friday.