Europe has spent years debating where its red lines are, and russia has spent those same years bringing the war closer. Today, a Kyiv-Warsaw train was struck just 2 km from 🇵🇱. There is really one red line: the border of a sovereign country & it was crossed in 2014. https://t.co/zoRFiDThGW #Ukraine #Russia #Sovereignty #PL #UA #RU