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Ukrainian forces made gains against pro-Russian rebels in east of the country, seizing the towns of Krasnogorovka and Staromikhailovka just outside of Donetsk.
The seizure brought the army to the edge of one of the last cities still in rebel hands following its advances in the past month. The other is Luhansk, near the border with Russia.
Shelling near the area where a Malaysian airliner was downed last month forced international experts to stop their search for victims at one part of the crash site, but a local ceasefire enabled them to work unhindered at the main part.
David Cameron has said Nato and its members "will not be intimidated" by Russia in the wake of its actions in Ukraine.
Speaking ahead of the Nato summit in south Wales next month the prime minister said the gathering marked a "pivotal" moment in Nato's history.
He said: "In 2014, the world is more unpredictable than ever. To the East, Russia has ripped up the rulebook with its illegal annexation of Crimea and aggressive destabilisation of Ukraine.
"To the South, an arc of instability spreads from North Africa and the Sahel, to Syria, Iraq and the wider Middle East.
"So we must use the Summit to agree how Nato should adapt to respond to and deter such threats; and to ensure the continued collective defence of all its members."
The summit near Newport is the first in the UK since Margaret Thatcher hosted the alliance in 1990, as the Cold War was ending and Nato started to chart a course for a new relationship with Russia.
Prime Minister David Cameron has said Nato must rethink its long-term relationship with Russia in the wake of its "illegal" actions in Ukraine.
He also called for Nato's members to take measures to ensure it can respond quickly to any threat from Moscow.
In a letter to his Nato counterparts, Mr Cameron said the measures should include sustaining a "robust" defensive presence in eastern Europe, keeping equipment and supplies in key locations and beefing up Nato's Response Force of swiftly deployable land, air, maritime and special operations troops.
The letter comes just days after a government report warned the trans-Atlantic military alliance was not adequately prepared for a potential threat from Russia.