The UN would definitely not intervene militarily on behalf of Armenia if Turkey or Azerbaijan attacks. And France would be unwilling to risk war with any of the nations around Armenia by putting boots on the ground there. The only country willing to do so has been Russia. And even then, quite reluctantly. Armenia is almost entirely at the mercy of Russia and Iran to deter Turkey and Azerbaijan from attacking at will.

Change to being allied with who? Turks and Azeris hate them. The only other option is Georgia, which would be a smart move but Georgia likely wouldn't oblige if they felt it would upset Turkey at all.

Outside of the region, nobody else has shown interest in stepping in on Armenia's behalf since it might upset one of its neighbors that are considered to have greater geopolitical importance. Armenia is stuck in an absolutely terrible situation and has very few options available.