The eastern regions of Donetsk and Luhansk have been gripped by heavy fighting as government forces try to retake rebel strongholds.
Andriy Lysenko, a spokesman for Ukraine's security council, said Ukrainian forces were advancing towards the town of Shakhtarsk, 25km (16 miles) from the crash site.
He said the Ukrainian government hoped to "liberate territory" around the downed plane to provide security for international inspectors.
Shelling was also reported close to the site, near the town of Grabove, on Sunday.
Separately, in an interview with Ukraine's Inter TV, Defence Minister Valeriy Heletey confirmed that a column of 41 troops had crossed into Russian territory. An investigation was taking place, he added.
Earlier, Russian media reports said the servicemen had defected to Russia.
The US state department says these images show where
multiple rocket launchers have been used to fire from Russia into Ukraine
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