long range air-to ground missile carrier isn't really a threat to us in a modern warfare situation. In a real-life conflict modern fighters would destroy these aircraft before they got close enough to do us any harm. The RAF's Typhoon is a formidable aircraft, and well able to handle the Russian 'threat' - not that there is one at present.
President Putin knows exactly what he's doing, and he's doing it for two reasons:
1. To give the Russian people a much-needed 'don't mess with us' morale boost.
2. To increase his own popularity at home. The Russians adore a leader who rattles a big sword, anmd does it flamboyantly. The Bear is an impressive looking thing, and Putin knows that American citizens will be unnerved by the sight of a few of them cruising towards American air-space.