I like the analogy between the Klingons of STD and modern day Russia.
The Federation and NATO both try to cloak themselves in good intentions and as a guarantor of “peace”, while they at the same time aggressively push up against the borders of other powers (Russia, China the Klingon Empire) who can only watch the passive aggression with trepidation and worry.
And while both do lip service to concepts like “diversity”, it’s clear that it’s a diversity very narrowly defined.
A Federation truly devoted to peace and justice, would have no problem with readjusting their borders to ease Klingon worries, just like a NATO truly devoted to peace and being a defensive alliance wouldn’t constantly push up against the borders of other powers.
One thing that counts as a positive for STD I guess, is that for the first time in Trek history, the Klingons vs The Federation isn’t a simple question of evil vs. good.
But of one evil vs a greater evil.
I kind of don't like using the good vs evil argument, because then it is just like Star Wars, and life isn't like that. Still we are never given elaboration about aspects of the Federation system, so I think we are suppose to take the Federation as good, albeit a flawed good by the time we got to DS9 and after. So it isn't really a lesser evilism either.
Modern day antagonism between the Russian Federation and NATO are definitely more complicated than what is presented in any Trek, including Discovery. I already talked about how it is very likely NATO was always formed with the Soviet Union and later the Russian Federation in mind, and in modern times as the intervention in Libya showed, also for interventionism to eliminate rival regimes.
At the end of WW2, the USA came out the biggest winner, by far (even though most of the winning of the war was done buy the USSR with 85% of Nazi casualties on the Eastern Front, the Soviet Union in this sense was a loser with some 28 million deaths). The new order had the US as the main capitalist power and other capitalist powers as either vassal states or junior partners with the USA. The competition among capitalist empires which lead to World War I and World War II for a time ended while the nations rebuilt under the protection of the relatively unscathed USA.
But with the Socialist bloc gone in Europe and Russia, I think the only thing holding together NATO and the EU is their fear of Russia. If it had not been for the USSR and Russia now, I think the interests of these states are not aligned and are contradictory and competitive, and it would only be a matter of time before the resumed waring on each other. Already the EU is falling apart, for many reasons, but I suspect eventually it will end and go the way of the Warsaw Pact before it and collapse when the countries who are in debt and can't print money, like Greece and Spain, will eventually have to resist either their governments or their people.
But what the West wanted to do to Russia, it had the opportunity to do under Yeltsin. The results of shock therapy (which killed some four million people, note that those who love to accuse Socialism as artificially manufacturing deaths as an economic system fail to apply the same culpability in reverse to shock therapy) were that the western multi-national corporations and banks began to reduce Russia to a colony for resources and wealth for the West and as a land where property was held privately, mostly by oligarchs and mafiosi. Putin is just a response to that period. He came to power in a country with a heavy executive (which the West allowed Yeltsin to create when he suspended the parliament {Duma} and sent tanks to fire on them, and rushed in his new Constitution which gave the presidency expanded powers), he came to power because Yeltsin selected him hoping that Yeltsin's family would not be prosecuted for their corruption, and he stayed in power by reversing shock therapy which the people hated. Those who advocate Putin's removal don't realize that he is one of the least anti-Western or anti-American political forces in his country. Most Russians hate the West and the USA more than Putin.
The actions of Russia in South Ossetia, Crimea and Donbas are reactive moves rather than provocative ones. The problem with the liquidation of the Soviet Union, aside from the massive deaths, was that one third of all the world's Russians now lived in countries other than Russia. The EU's report on the conflict in between Georgia and the Russian Federation over South Ossetia did not absolve Saakashvili for his role in provoking the conflict. In the case of Crimea, there had been a coup in the capital of Ukraine, Kiev. The Crimean politicians enjoyed a close relationship to the Russian Federation and worried about the anti-Russian bent of the Euromaidan and the coup. The Crimean politicians asked to be annexed to protect the status quo (so it is almost more like Crimea annexed Russia). In the Donbas, because the new Kiew government announced anti-Russian measures, such as protecting both the Ukrainian and Russia languages to just protecting Ukrainian which would be made official, appointing new governors from Western Ukraine into the Donbas which the local populace neither selected or supported, and so on, all caused backlash which allowed for the "foreign volunteers" to step into.
I look at the actions of the Russian Federation under Putin, therefor as reactive (to Saakashvili or the the coup in Kiev), not as proactive. This is not to say they are justified, but that the sequence of causality is not purely subjective. If Putin or any Russia ruler were to sit by as Russians in a neighboring country are bombed or massively persecuted, the Russian populace would not stand for it. Thereby, the Russian state must act or loss favor with its populace.
By the way, notice that ever post-Soviet state to have a so-called "color revolution" but the next election cycle they vote out those who came to power in the "color revolution" and return to the old elites. That is because the pro-Western color revolution politics always sell of the country to Western corporations, banks, the IMF, World Bank and so on. It seems to me the populations do not like their ruling elite, but the like the pro-West ruling elite even less. I suspect their local corrupt elites will steal less than the West will. Meanwhile, i think the post-Soviet ruling elites would happily work with the West if they would be kept in charge, where as the West has no interest in keeping the ruling elites in charge, they want regime change.
I don't care much for Putin, but I don't view him as some evil mustache-twirling mastermind. He isn't playing a big chess game, the Russian state is lumbering, stumbling and bumbling along from crisis to crisis. Notions that he is a great mastermind are in my view projections by those who don't understand context or the culpability of the Western side in the tensions, and those who don't want to admit that the Democratic Party in the USA has fallen out of favor because it wasted its mandate to end the wars and crack down on the banks and also that Hillary Clinton was a lousy campaigner who snatched defeat from the jaws of victory by being a very poor politician. It isn't that different to the Red Scare, when all union organizing in the USA was alleged to be done from Moscow, or even the segregationists who insisted that Civil Right was a plot by communist agitators, or that all rebel and terrorist movements around the globe were being created by and run by Moscow. Its the same kind of projection/conspiracy thinking.
I suppose if any Klingon ruler were analogous to Putin, I would argue that retroactively it should be seen as Gowron, a figure who rose in power with the help of the Federation, who for a while enjoyed a healthy friendship with he Federation, but never the less, because of rapidly shifting geopolitics (the lead into the Dominion War) was in a political position whereby the Klingons felt they had to intervene now or the risk of waiting would be too late. These moves, viewed as hostile and provocative by the UFP, eventually led to Gowron's falling out of favor with the UFP. That sounds close to what happened with Putin and the USA.
Lastly, I wouldn't go as far as to say what the UFP's "real motives" are. I think the UFP and Starfleet seem sincere in their values and actions. However, we are never fully aware of the scope and power of Section 31, particularly in the 22nd century. Section 31 I suppose is mostly an analog to the CIA, with perhaps some FBI and NSA thrown in.
As far as legality, depends on whether we are looking at the US Constitution, although the Constitution states that treaties the USA signs are the highest law. But the USA constantly violates treaties it doesn't agree with (even when they sign them), and can afford to do so because they are too powerful for anyone to try and hold them accountable. I am sure a criminal investigation into the CIA would reveal numerous violations of international law including but not limited to: assassinations, torture, arming and training of terrorists, libel and the promoting of deliberate misinformation, economic and civilian sabotage, illegal wiretapping and surveillance, and election tampering.
The other day I joked that if President Trump wanted to get back at the intelligence agencies that are now pushing for investigation of his campaign, he should announce a criminal investigation of the intelligence agencies. Of course he won't do that, and anybody who doesn't want to end up like JFK wouldn't dare even mention it. If such an investigation were to actually occur (and miraculously the incriminating documents wouldn't some how mysteriously and "accidentally" be destroyed) I am fairly certain the CIA would through at least the deceased presidents under the bus and say they were ordered to do so and they serve the president, in which case a case for a former president's criminal charges could be brought up to any living president implicated. Again, it is a fantasy, because the law will never be applied to those that high up.