By Sabine Siebold and John Irish BERLIN (Reuters) -NATO is confident that it can overcome objections by Turkey and quickly admit Finland and Sweden, its deputy chief said on Sunday, as the alliance prepares for a historic enlargement in the Nordic region prompted by Russia’s war on Ukraine. Finland’s President Sauli Niinisto confirmed on Sunday that his country would apply for membership and Sweden is expected to follow suit as public support for membership has grown amid security concerns. Foreign ministers from NATO’s 30 member states are holding two days of talks this weekend in Berlin that…