Ukraine has been in the news because it is at the centre of a big argument between the world's most powerful countries. The disagreement, between Russia and the world's other big nations like the UK and America, is over a region in the south of Ukraine, called Crimea.

But in the middle of the heat, the airline company S7, showed its heart and did a guerilla campaign. They placed big banners showing the logo of peace, with an airplane in it, saying Moscow - Peace - Kiev.