Ukraine says Russia has amassed 100,000 troops near its border prompting warning from NATO

Ukrainian President Volodymyr Zelenskiy says nearly 100,000 Russian troops are near his country's border and that further information about troop movement has been provided to Kyiv by Western allies.

"I hope the whole world can now clearly see who really wants peace and who is concentrating nearly 100,000 soldiers at our border," Zelenskiy said in a speech delivered last week.

This is not the first time this year Russian troop movement near the Ukrainian border has stoked fear of a possible attack, though Moscow has repeatedly dismissed the possibility and has instead complained about increasing NATO activity in the region. 

On Monday, NATO Secretary-General Jens Stoltenberg warned Russia that the Western military alliance will stand with Ukraine amid escalating tension at the border. Stoltenberg encouraged Russia to be transparent about its military activities in to deescalate the situation. 

"We have to be clear-eyed, we need to be realistic about the challenges we face. And what we see is a significant, large Russian military build-up," Stoltenberg said. "We see an unusual concentration of troops, and we know that Russia has been willing to use these types of military capabilities before to conduct aggressive actions against Ukraine."