The sweet and sour relationship between the United States government and their Russian counterpart knows no end and is boundless.

They are taking their unstable relationship to the conflict in Ukraine.

A new ceasefire deal was signed between Ukraine and pro-Russian rebels and it took effect from midnight Saturday ahead of the New Year and Orthodox Christmas holidays.

The US State Department had announced on Friday that Washington had "decided to provide Ukraine enhanced defensive capabilities as part of our effort to help Ukraine build its long-term defense capacity".

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But in a strong-worded statement on Saturday, Russian deputy foreign minister Sergei Ryabkov accused the United States of "crossing the line" and fomenting the conflict in eastern Ukraine, a region known locally as Donbass.

"Kiev revanchists are shooting at Donbass every day, they don't want to conduct peace negotiations and dream of doing away with the disobedient population. And the United States has decided to give them weapons to do that," Ryabkov said.

"Today, the United States clearly pushes (Ukrainian authorities) towards new bloodshed," he said, adding: "American weapons can lead to new victims" in the neighbouring country.

More than 10,000 people have died and almost 24,000 have been injured since the pro-Russian insurgency broke out in eastern Ukraine in April 2014.

A UN report said this week that 220,000 children are at imminent risk of being hurt by mines and other explosive weapons in eastern Ukraine, one of the most mine-contaminated places on earth.

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