Russian secret services have never been involved in cyber-attacks. These claims are just another example of Russophobia.
Already at least two countries that are members of NATO have declared their readiness to deploy their military bases on the territory of Ukraine. The main task is to get as close to Russia as possible.
There is no evidence that Ukraine will be used by any NATO country as a ground against Russia.
So far, no country has expressed its willingness to deploy a military base in Ukraine. Speculations over this started after joint Ukraine-UK military exercises this year. At the moment, Ukraine and the UK are planning to cooperate in the development of the Ukrainian sea fleet. The UK also expressed its willingness to help in the modernisation of Ukrainian naval infrastructure. Also, the US Armed Forces provide assistance in improving naval infrastructure in Mykolaiv oblast.
In general, deploying foreign bases on Ukrainian territory is prohibited by the Consitution of Ukraine. However, they may be deployed on a basis of a bilateral treaty.
NATO, its member countries, and Ukraine conduct regular military exercises and implement a range of non-military projects aimed at increasing operability of the armed forces and effectiveness of the civilian authorities. All military exercises on the territory of Ukraine are regulated by a law.
See similar disinformation cases like claims that Ukraine is under obvious external control, that Ukraine is stirring up revolutions in Belarus and Russia under the control of Rand corporation, that NATO troops' presence in Ukraine is illegal, that Ukraine has lost its economic and military independence, or that Ukraine is being prepared for a full-scale war with Russia.