MOSCOW – Whoever becomes the next president of the United States will have to deal with a Russia that seems both familiar and, increasingly, unfamiliar. For centuries, Russia has been a resource-exporting country, an economic laggard and a touchy partner, driven by a European culture and a decidedly un-European body politic. But now those constants have been joined by new factors: President Vladimir V. Putin’s political unpredictability and his readiness to use military force.

The Russia of the past two years seems to no longer care about lasting partnerships or international agreements. It scorns predictability and dependability as weaknesses. Its one successful reform since 2000 has been to revamp and re-equip its armed forces. Russia’s resources are stretched, but Mr. Putin seems determined to overcome those disparities with the West with political and military agility.

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