Biggest threat to UK defense is May's deal where our armed forces control & equipment purchases are handed over to the EU and it will at best restrict out roll in the planets most successful intelligence gathering, the 5-eyes system, as we will be forced to share this with all EU countries some of whom will pass it on to our enemies. France, Greece and the Balkan countries have particularly bad records on this where they are happy for the secrets travel to a common north-eastern European enemy. As usual with all state propaganda Dick's warning on weakened defense is actually the better safer option (where it won't affect our 5-eyes membership) than May's treason. May's propaganda on Brexit is like Russian, the reverse of the truth: So large is small, white is black & lies are the truth or vice versa. So 1984 has arrived.
Several American's I've spoken to are embarrassed with Trump constant lying and zero state craft and I feel the same about serial liar May and the effect is is having on our global standing. Yes Western politicians lie, but they don't normally do it on the industrial scale and level of the Kremlin and 3rd world banana republics. This is what happens when they are both hiding & selling their hidden agendas at the same time. Trump where he is a mobster & being POTUS is a new personal money making opportunity, despite their emolument laws and with Remainer May & her grey suits by locking us into the EU forever while pretending to leave.
The biggest threat to the West and our way of life is what I call the current Axis of Evil: China, Russia, Iran & DPRK. If the West doesn't start taking their Cold War 2.0 actions seriously and pushing back against their cyber warfare then by default, when you don't defend an attack you lose and then a cold war, as a last ditch survival tactic, changes to a hot one. I keep telling people the very worst situation you can be is in the middle of a hot war like Syria or Ukraine and the second worst is living under a ruthless dictatorship and their regime, where everything you possess is leased from the state, including your life and any of the leases can be terminated at anytime with no right of appeal. Don't let it happen to you.
The 5-eyes system already has issues with intelligence sharing restrictions to the US where they have a Russian owned POTUS who has passed on intelligence to his Kremlin boss and his agents. Expect this to form part of his 2019 downfall along with singing canary General Michael Flynn who has cut a deal with Special Investigator Bobby 'three sticks' Mueller. In the US this is still a capital crime.
Before Treason May's sellout we have rightly resisted a Euro Army as a French driven duplication & undermining of NATO. The issue as usual since 1991 is not the colour of the badges and shoulder spaghetti but the colour of the money as inadequate European defense spending will only change marginally and be more than absorbed by the increased duplication costs. The only serious EU military forces in Europe are the UK, France, followed by the UK and France. Honourable mentions are for Poland (as they nervously look East & rapidly increase their defense spending), Greece (due to Turkey) and the three too small to really matter Baltic countries. Germany is currently one of the worst in terms of GDP spending and use due to a shortage of weapons black painted broom sticks as small arms substitutes on German army exercises. Several European NATO countries (not the UK) have been rumoured to struggle to maintain small numbers of serviceable aircraft and weapons for them as part of the US lead consortium in Afghanistan.