Ukraine has leveled fresh charges that Moscow is sending military support to pro-Russian separatists in the east.
A Foreign Ministry spokesman said five columns of heavy equipment were spotted crossing into Ukrainian territory on November 24.
Evhen Perebyinis told journalists on November 25 that a total of 85 vehicles had been detected in the five columns that entered at the Izvaryne border crossing point from Russia.
"The Russian side is continuing to provide the terrorist organizations of the Donetsk and Luhansk people's republics with heavy armaments," said Perebynisis.
Separately, the Ukrainian military said one soldier had been killed and five others wounded in the past 24 hours as a shaky cease-fire declared on September 5 continued to come under pressure.
The six-month conflict in the east of Ukraine has left more than 4,300 people dead, according to the United Nations.
Based on reporting by AFP and Reuters