(S (S (ADVP (RB So)) (S (SBAR (IN while) (S (BASENP (NNP Canada)) (VP (VBZ is) (VP (VP (VP (VBG offering) (BASENP (PRPD its) (NN hand))) (PP (TO to) (BASENP (DT the) (NNP United) (NNPS States)))) (PP (IN as) (NP (BASENP (DT a) (NN gesture)) (PP (IN of) (BASENP (NN assistance))))))))) (COMMA ,) (S (BASENP (PRP it)) (VP (VP (VBZ serves) (ADVP (RB dually))) (UCP (PP (IN as) (NP (BASENP (DT a) (NN self) (NN assurance)) (SBAR (IN that) (S (BASENP (NNP Canada)) (VP (VP (MD will) (RB not)) (VP (VB be) (VP (VBN affected) (PP (IN by) (BASENP (DT the) (NN spill)))))))))) (CONJP (COMMA ,) (CC and)) (S (S (VP (TO to) (VP (VB stop) (BASENP (PRP it))))) (SBAR (IN before) (S (S (BASENP (PRP it)) (VP (VBZ reaches) (BASENP (DT the) (NN border)))) (SBAR (IN if) (S (BASENP (PRP it)) (VP (MD does) (VP (VB get) (VP (VP (VBN picked) (PRT (RP up))) (PP (IN by) (BASENP (DT the) (NN currents)))))))))))))))) (PERIOD .))