"The vote is illegal and illegitimate, and the European Union will not recognize it," Mogherini said.
Remains found Friday from the downed Malaysia Airlines plane are making their way to the Netherlands for identification.
Russian overflights of Europe are “provocative and confrontational,” says one analyst.
The three parties have reportedly agreed on a deal to resume Russian gas supplies to Ukraine.
Russian airborne forays into Europe may be seen as aggression -- or they may be a form of diplomatic brinksmanship.
France will not deliver the ships until the crisis in Ukraine cools, despite claims by Russian Deputy Prime Minister Dmitry Rogozin.
Some critics of Russia question whether its motivation is financial or whether prolonging the wrangling suits Moscow's diplomatic agenda.
NATO aircraft tracked Russian aircraft over the Baltic in what the Western alliance called an unusual burst of activity at a tense time in East-West relations.
Following Sunday's elections, the self-proclaimed republics of Donetsk and Luhansk announced plans to elect regional leaders in eastern Ukraine.
The survey also showed that concerns about the economy and job prospects had been replaced by worries about war and terrorism.
Dutch prosecutors investigating the MH17 tragedy consider theory that it might have been shot down by a military aircraft.
FIFA President Sepp Blatter said a boycott "will never give any positive effect" in an interview with Russian sports press.
Although a truce went into effect on Sept. 5, several violations have been reported over the past few weeks.
A slew of organizations including the OECD, the IMF and leading institutes have slashed their forecasts for German economic growth.
But a surprise was the strong performance registered by allies of ousted president Viktor Yanukovich.
Election results are not expected to be finalized for 10 days.
Ukraine goes to the polls today to vote for a new government.
The vote is seen as likely to install a pro-Western parliament and strengthen the president's hand in dealing with separatist rebels.
Sunday's election is aimed at clearing out remaining Yanukovich loyalists.
Ukraine votes for parliament on Sunday. Right-wing extremists say either change comes at the polls, or they will revolt.
EU members pledged 1 billion euros ($1.25 billion) to counter Ebola in West Africa at a summit in Brussels. The U.K.-led funding, pledging 100 million euros.
The EU and Ukraine will discuss a bridging loan to Kiev next week so the country can pay in advance for Russian gas deliveries for the coming months, the German chancellor said.