 However, Russian Foreign Minister Sergei Lavrov has said Russia reserves the right to drop out of the pact if it believes U.S. missile defense plans for Europe threaten its security.
<clarity>  However, Russian Foreign Minister Sergei Lavrov has said Russia reserves the right to drop out of the pact if it believes U.S. missile defense plans for Europe threaten its security.
 However, Russian Foreign Minister has said Russia reserves the right to drop out of the pact if it believes U.S. missile defense plans for Europe threaten its security.