In 2015, as a result of serious NATO-Russian tensions in Europe, Germany announced a major increase in defense spending. In May 2015, the German government approved an increase in defense spending, at the time 1.3% of GDP, by 6.2% over the following five years, allowing the Ministry of Defense to fully modernize the army. Plans were also announced to significantly expand the tank fleet to a potential number of 328, order 131 more Boxer armored personnel carriers, increase the submarine fleet, and to develop a new fighter jet to replace the Tornado. Germany considered increasing the size of the army, and in May 2016 it announced it would spend €130 billion on new equipment by 2030 and add nearly 7,000 soldiers by 2023 in the first German military expansion since the end of the Cold War. In February 2017, the German government announced another expansion, which would increase the number of its professional soldiers by 20,000 by 2024.