By Anne Kauranen HELSINKI (Reuters) – Finnish presidential frontrunner Alexander Stubb said on Thursday NATO should become “more European” and that his country would remain an important partner for the United States whether or not Donald Trump is re-elected. In an interview with Reuters, Stubb promised unconditional support for Ukraine and ruled out an improvement in Finland’s relations with Russian President Vladimir Putin until Moscow stops the war against Kyiv. Stubb, 55, leads opinion polls before Finland’s Jan. 28 presidential election, which precedes presidential elections this year in n…