"We are paying increased attention to the incident; we strongly oppose and condemn the murder, and are deeply concerned that this incident could lead to greater instability of the situation in the region,"Chinese Foreign Ministry Spokesman Lin Jian said.

"The Islamic Republic of Iran will defend its territorial integrity, dignity and honor, by making the terrorist occupiers regret their cowardly act," Pezeshkian said, as cited by the Tasnim agency.

“The Israeli army carried out the operation after receiving the "green light" from the United States, and responsibility for its consequences rests with both Israel and the American administration. They committed this murder to exert pressure on Hamas, and to force us to accept their negotiation terms - which we reject. We affirm that the Israeli army will pay dearly for this crime," he said.

“The martyrdom of Haniyeh will only strengthen the movement's resolve to resist aggression, and will not weaken the support Hamas provides to the resistance (force) against the Israeli enemy. The killings of our leaders have never stopped us in the past. All options and scenarios for responding to this murder are possible, and the current developments, including a strike on Beirut, could lead to a large-scale regional war - for which Washington will also be held accountable," Taha concluded.

"The criminal terrorist Israeli regime killed our dear guest in our house and [forced us to] grieve, but it also prepared the ground for its harsh punishment," Khamenei was quoted as saying by the IRNA news agency.

"The increased military buildup by the US and Japan in the Asia-Pacific region means a greater risk for war, particularly nuclear war," Hawaiian activist with Okinawan roots Robert Kajiwara tells Sputnik.

"If there's any country that should be against nuclear arms, it should be Japan, given the use of nuclear weapons against the cities of Hiroshima and Nagasaki. Japan should be strongly against the storing of nuclear weapons in its territory. Unfortunately Japan hasn't learned anything from World War II and appears destined to repeat its past mistakes," Kajiwara concludes.

"Not to mention, the US military is one of the largest polluters in the world, and has poisoned the water in both Hawaii and Okinawa."

"In Hawaii, Guam, Alaska, and the Northern Mariana Islands, the anti-military and pro-independence voices are the minority since the Native peoples of these places are also now minorities," says Kajiwara.

“There's no doubt that the economic impact [from the sanctions] is felt to a much greater extent here in the EU itself compared to Russia. The Russian economy, according to the official data, is doing very well and it appears to have adapted to the sanctions,” Beck pointed out.

“So the EU has basically harmed itself with these sanctions, or rather to be more precise, the bloc has massively harmed European industry and European consumers. But it [the restrictive measures] don’t appear to have had much impact on the Russian economy,” Beck emphasizes.

“The EU probably underestimated the degree to which the Russian government had prepared for the eventuality of sanctions, including far-reaching restrictions on energy imports into the EU as well as financial transactions. On this occasion, I think the sanctions have proved ineffective and they have failed insofar as Russia is concerned,” he concludes.

“These sanctions, which are designed to punish Russia, have failed to do so. In fact, they've boomeranged back on Europe. And Europe continues to move forward, putting more sanctions into more sanctions, all the while Russia gets stronger economically,” he notes.