Since December, Russia has gradually amassed more than 100,000 troops along its border with Ukraine. Amid stalled talks between the US and Russia, French President Emmanuel Macron is embarking on a solo mission to Moscow and then Kyiv, insisting a diplomatic solution is still possible. For more on what to expect from this latest diplomatic push, we spoke to Natia Seskuria, Associate Fellow at the Royal United Services Institute. "Russia will not stop at Ukraine," she warned.