TBILISI (Reuters) -- Georgia and Russia accused each other on April 16 of building up forces at the de facto borders between their forces, and preparing "provocations."
Each side said the other was looking to take advantage of heightened political tensions in Georgia, where the opposition has been protesting in the streets for a week demanding the resignation of President Mikheil Saakashvili.
Russia sent troops into South Ossetia to crush a Georgian assault on the separatist region in August last year, and then officially recognised it and another rebel region of Georgia, Abkhazia, as independent states.
A European Union mission monitoring the ceasefire said it had registered extra Russian troops and hardware at the boundaries between Georgian-controlled territory and South Ossetia and Abkhazia, but had not monitored any significant Georgian build-up.
EU mission spokesman Stephen Bird said the "significant" Russian reinforcements at the boundary of Abkhazia appeared to have moved back on April 16.
Asked if they had seen a similar pullback in South Ossetia, Bird said: "Not as far as we have noticed yet."
A confidential assessment compiled by EU diplomats in Georgia and seen by Reuters said the Russian reinforcements included tanks, armoured personnel carriers, artillery, and "Grad" multiple-rocket launchers.
"Thus the situation at the ABL [administrative boundary line] remains in flux and volatile as Russian/South Ossetian forces continue to establish new facts on the ground," said the the assessment, dated April 13.
Georgian Interior Ministry spokesman Shota Utiashvili said the Russian military had brought in extra forces, "but they never withdrew the old forces."
"We are concerned about this," he said. Utiashvili said Georgia believed an extra 5,000 Russian forces had entered both regions ahead of the protests.
Russia said it had taken "precautionary measures to ensure security" in South Ossetia and Abkhazia during the tense period, adding it had concrete information about likely provocations.
Foreign Ministry spokesman Andrei Nesterenko told a news briefing Russian forces were conducting exercises in order to dissuade Tbilisi from any military action, which he suggested would be used to distract attention from opposition protests.
"We have repeatedly come up against the practice, which has now become customary for official Tbilisi, to search for a way out of internal problems by using external aggression," Nesterenko said.
"The real danger for the stability of the region is the continued remilitarisation of Georgia including the concentration of special forces and military equipment close to the territories of Abkhazia and South Ossetia."