As commander of the National Guard of Alaska, Palin must be well aware of the Russian incursions into our airspace, a story largely unnoticed in the MSM. And the threat is real and growing.
Additionally, Norway and Sweden are also seeing Russians invading their airspace.
I couldn't find the article buttressing your assertion; but I know it's here at FR.
Britain intercepts Russian Bombers Every Week, April 5, 2008
Russian Bear bombers fly along Alaskan, Canadian coastline, September 30, 2007