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The impeachment inquiry into U.S. President Donald Trump will reach a critical juncture on Wednesday.
Russian President Vladimir Putin wrote to 18 European countries warning of a "critical situation" if Ukraine does not pay for Russian gas soon.
Protests continue in Ukraine, but its economy needs international help, says the US.
Pro-Russian groups have seized a number of buildings in 10 cities in eastern Ukraine, causing Kiev to launch a military operation on Tuesday.
The airport was earlier seized by pro-Russian armed rebels.
The US has threatened tougher economic sanctions if Russia fails to abide by a new international agreement to help de-escalate the crisis in Ukraine.
Witnesses said that attackers came in four cars, shooting at Pro-Russian forces at the roadblock, which were reportedly only armed with sticks.
"We want to assist," said US Vice President Joe Biden.
Ukrainian government condemned the incident and ordered its troops to launch attacks against pro-Russian militants striving to control eastern Ukraine
Russian government claimed that the jets were conducting combat exercises.
Ukraine's acting prime minister blames Russia for recent clashes as the Federation continues to mass forces on its borders.
Recent development showed that the Russian is massing tens of thousands of troops in areas near the Ukrainian border.
Around 40,000 Russian troops are in Ukraine border.
Black plumes of smokes can be seen in the suburban part of Slovyansk, a city 160 kilometers (100 miles) west of Russia.
Ukraine suffered its bloodiest day in nearly three months on Friday.
UN Secretary General Ban Ki-moon called on all parties to implement the Geneva agreement.
Tensions continue to rise as separatist and government forces continue to fight for control.
Putin previously backed the referendum and later changed his stance after meeting with Chief of Organisation for Security and Cooperation in Europe.
President Vladimir Putin flew in to Crimea on Friday for the first time since it was annexed by Moscow.
The referendums are being conducted by the insurgent movements and are not regarded as legitimate by Kiev or the West.