A military pilot helmet next to fragments of a downed aircraft is seen in in Kyiv, Ukraine, Friday, Feb. 25, 2022. It was unclear what aicraft crashed and what brought it down amid the Russian invasion in Ukraine Russia is pressing its invasion of Ukraine to the outskirts of the capital after unleashing airstrikes on cities and military bases and sending in troops and tanks from three sides. (AP Photo/Oleksandr Ratushniak)