An article at Strategy Page discusses the ten most noteworthy developments in 2017 that had military implications. I was a bit surprised that North Korea wasn't on their list, but in any case here are the ten with just a brief excerpt from SP's discussion. There's much more of interest said about each of these at the link for anyone who'd like to follow up.
ISIL
The most extreme Islamic terror group on the planet, hated by all other Islamic terrorists, was defeated but not destroyed in 2017. It was driven underground where, if tradition holds, it will fester for a generation or so and then revive and repeat. In effect this is a chronic problem. It is an unending Moslem civil war between those (mainly Islamic terrorists) who want a worldwide religious dictatorship run by themselves, versus those representing the majority of Moslems who are getting tired of being threatened and murdered by Moslem religious fanatics.
Syria
The defeat of ISIL changed the outcome of the rebellion, or did it? Until late 2017 everyone more (the West and their Arab allies) or less (Assads, Russia, Iran, Turkey) concentrated on fighting ISIL. This effort appeared to have destroyed the rebel advantage because early on most Syrian rebels embraced Islamic radicalism. This was because most of the population was Sunni Moslems who the Shia Assads suppressed and exploited for decades. That meant that after 2012 Islamic radical rebels spent most of their time fighting other rebels. With the defeat of ISIL the rebels are much weakened but more willing to cooperate with each other. Meanwhile the coalition that saved the Assads is falling apart.
Colombia
Colombia has finally ended over 70 years of fighting and general misery. In 2017 the main leftist rebel force (FARC) made peace and the much smaller ELN is negotiating a similar deal. The death rate is way down as is crime in general. The drug cartels are moving their operations out of the country and the economy is one of the healthiest in Latin America.
China
China has been building modern warships at a record rate, something rarely seen in peacetime. China has been building world class warships faster and cheaper than anyone else. There is nothing magical about this, the Chinese simply were practical and ruthless in catching up. Practical in the sense that they managed to merge a market economy with a communist police state. That rather unnatural act may yet come apart but since the 1980s China has been learning from what Russia did wrong during the Cold War and putting their more effective methods into practice.
U.S.
The American F-35 has entered service and mass production is under way and on schedule. F-35s are entering service in large numbers (a hundred plus a year) over the next few years and will be used operationally. Some are already operating near combat zones, like the ones Israel has put into service. Israeli pilots, and all others who have flown the F-35 agree that the software and the degree of automation built in is spectacular.... The F-35 has a large number of sensors (receivers for electronic signals, six cameras and a very capable radar) and the fusion of all that data and presentation to the pilot based on the current situation is impressive and makes the F-35 much easier to fly, despite all the additional capabilities it has.
Israel
In 2017 it finally happened. Saudi Arabia and Kuwait went public in support of an Arab-Israeli alliance to oppose Iran.... The Israelis know that the anti-Semitic attitudes in the Arab world go back to before the emergence of Islam in the 7th century and have waxed and waned ever since. Anti-Semitism is again widely tolerated in Europe. But the United States has a new president who grew up in and around New York City, built a fortune there, has a Jewish son-in-law, Jewish grandchildren and a pro-Israel attitude that is more decisive and imaginative than that of the last few American presidents.
Palestinians
It’s been a long time coming but the Palestinians are losing all their primary sources of income and special status with the UN. The Americans, long the largest contributor, are withdrawing support as are a growing number of European donors. The Arab oil states are also cutting way back because of Palestinian corruption, inability to unite and the Palestinian refusal to make some kind of peace deal with Israel. The Arab oil states are also mad at the Palestinians for supporting Saddam Hussein’s plans to conquer all of Arabia (starting with Kuwait in 1990) and now working with Iran.
Pakistan
Pakistan fears the United States and India will carry out more air strikes and commando operations in Pakistan against Islamic terrorist targets. Pakistan is particularly concerned with protecting the Haqqani Network, an Afghan led group that has prospered under Pakistani protection and is now believed to control the leadership of the Afghan Taliban, Pakistan has long denied any connection with Haqqani, much less control of the group, but there is much evidence that ISI (Pakistani Intelligence) works closely with Haqqani. Growing American (and international) pressure has forced Pakistan to say it is acting against Haqqani. There is little evidence of that.
Philippines
After decades of effort the Philippines has finally made decisive progress in dealing with its endemic corruption, communist rebels and violence by Moslem separatists and bandits.
Iran
For the second time since 2009 Iran is undergoing a nationwide protest against the religious dictatorship. It’s not an armed revolution. The protestors have been loud but not violent unless attacked. Nearly all the deaths have been protestors attacked by the security forces. The government has called out its supporters (or simply those with a government job) to stage pro-government rallies. These are well guarded and thoroughly covered by state controlled media. The goal of the protests is to, at the very least, get the clerical dictatorship to openly discuss the mess they have made of the economy and much else in Iran.