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KYIV/MOSCOW: Ukraine’s military accused Russia on Friday of sending a column of 32 tanks and truckloads of troops into the country’s east to support pro-Russian separatists fighting government forces.

Thursday’s cross-border incursion, if confirmed, is a significant escalation of a conflict that has killed more than 4,000 people since the separatists rose up in mid-April and would call into question Russia’s commitment to a two-month-old ceasefire deal. The truce has looked particularly fragile this week, with each side accusing the other of violations after separatist elections last Sunday condemned as illegitimate by the West.

“Supplies of military equipment and enemy fighters from the Russian Federation are continuing,” military spokesman Andriy Lysenko told a briefing in Kyiv, describing a column that included 16 big artillery guns and 30 trucks carrying troops and ammunition as well as 32 tanks.

He said five Ukrainian soldiers had been killed in the past 24 hours although Kyiv has denied rebel charges of launching a new military offensive. Russian President Vladimir Putin summoned security chiefs on Thursday to discuss the deteriorating situation but announced no new moves afterwards. Although Russia blames the crisis on Kyiv and the West, Nato says it has overwhelming evidence that Russia has aided the rebels militarily in the conflict and it has left Moscow’s relations with the West at their lowest ebb since the Cold War.

A Nato military officer said on Friday the alliance had seen an increase in Russian troops and equipment along the border and was looking into reports of Russian tanks crossing into eastern Ukraine.

“If this crossing into Ukraine is confirmed it would be further evidence of Russia’s aggression and direct involvement in destabilising Ukraine,” he said. Russia denies arming the rebels but the ceasefire deal reached in the Belarussian capital, Minsk, now looks in tatters.

“The President noted a significant deviation from the implementation of the Minsk protocol, which is leading to further escalation of the conflict,” a statement on the Ukrainian presidential website said after President Petro Poroshenko spoke to German Chancellor Angela Merkel by phone.

Although Russia did not respond to Kyiv’s latest accusations, it said it still supported the ceasefire deal.

“We support the continuation of the Minsk process and advocate holding another meeting of the Contact Group (of negotiators),” Kremlin foreign policy adviser Yuri Ushakov said. “But not everything depends on us. There are a lot of factors.”

Russia denies direct involvement in the conflict but stoked tensions by annexing the Crimean peninsula in March after the overthrow of a Moscow-backed president in Kyiv. The rebels rose up weeks later in the mainly Russian-speaking east and Western governments have imposed sanctions which have aggravated an economic downturn in Russia, whose rouble currency is in sharp decline.

The increase in tensions stems from Sunday’s leadership elections in the Donetsk and Luhansk “people’s republics”, which the West and Kyiv say violated the Minsk agreements.

The Ukrainian government responded by revoking a law that would have granted the rebel-held eastern regions much more autonomy and would have provided them with cash.