WASHINGTON, Dec. 14 -- Rep. Tom Cole, R-Oklahoma, issued the following column: For several months, an increasing and disturbing presence of Russian military troops and equipment has lined the Ukrainian border, heightening concerns that Russia intends to invade in the coming days. With tensions between these two countries expected to reach a boiling point, it is worth considering the gravity of the consequences of such conflict and why the danger facing our friends in Ukraine matters to the Unit  more