By Anne Kauranen, Essi Lehto and Mike Stone HELSINKI/WASHINGTON (Reuters) – Finland has sealed a deal to buy dozens of F-35 stealth warplanes from the United States, in a sign of its military’s close ties with NATO at a time of high tension between the West and Russia in Europe. The northern European nation – which borders Russia and was historically neutral during the Cold War – signed the $9.4 billion agreement on Friday to buy 64 radar-evading Lockheed Martin jets. While the planes will not enter service for several years – non-NATO Finland has previously said 2027 – the agreement reflects …