According to Many Realists, Which of the Following Is Not

According to many realists, which of the following is not one of Russia's strategies to enhance national power, preserve sovereignty, and balance against the United States?

A) defying one of the key norms of the liberal world order by acquiring territory by force in Ukraine
B) modernizing and building up its strategic nuclear arsenal to counter the weapons of the United States, China, and other major powers
C) deployed missiles close to the border with Poland and Lithuania, thereby violating the Intermediate-Range Nuclear Forces Treaty
D) concluding new trade agreements with the EU, in part to stabilize East-West relations