HELSINKI (Reuters) -Finland will on Saturday close four of the nine crossing points on its border with Russia to stem a flow of asylum seekers to the Nordic nation, Prime Minister Petteri Orpo said on Thursday. Finland's president said on Wednesday a rise in the number of asylum applicants arriving on the country's eastern border appeared to be Russian revenge for Finland's defence cooperation with the United States. Finland, a European Union country whose accession to the NATO alliance earlier this year after decades of non-alignment angered Moscow, shares a 1,340-km (833-mil...