The West specially USA and Germany have been pouring in weapons specially missiles into Ukraine. Since supply of weapons in war to enemy countries attracts attacks on the war material supplying countries, Russia should have responded with attacking on the west. But it has not done so nor it intends to do. The reasons are (a) Russia has not declared war on Ukraine. Putin calls it a special military operation. (b) The US and Germany have not declared war on Russia and are not directly involved in the military conflict in Ukraine, which Russia considers "not a war." (c) So far, even on Russian state television, there have been no calls from the mouths of the most inveterate propagandists to destroy missiles going to help Ukraine on the territory of third countries
Russia has nor right to attack as yet nor Putin or Russia want to do that since Putin's priority is to settle Ukraine issue first and it does not want to divert its intentions for that. Putin thus is not ready now to draw new countries into the war.

Why does the west supplies more of the anti aircraft missile to Ukraine than other weapons/ need some discussion. Russian aircrafts caused hell of devastation in Ukraine generally un-interfered. There were expectations that Ukraine will give up as Iraq gave up to USA in 1991. But it had not occurred. Soviets strategy of air operation has never been the same as that of the US. Soviets planned to use aircraft in close cooperation with ground based SAM batteries and ground control, working close to frontlines and not going out of the friendly SAM range, attacking targets in the tactical and close operative depth.
https://www.quora.com/Does-the-performance-of-the-Russian-Air-Force-fighter-and-attack-aircraft-over-Ukraine-demonstrate-that-their-planes-are-substandard-or-just-that-their-pilots-arent-up-to-scratch
The main task of Soviet Airforce was to support troops close to frontlines, not make strategic strikes deep into enemy territory. The attempts to be more like NATO were made in Syria, but opposition in Syria was armed much worse than Ukrainian Armed Forces today. SEAD was never the strong point of Soviet/ Russian air force; to make matters harder not only Ukraine inherited very potent SAM defenses from Soviet times but also the saturation of the area with donated MANPADs. The bulk of work on the enemy frontlines is done by artillery. Strategic strikes are accomplished with cruise missiles. Aircraft then supports troops in the tactical and closest operative depth, or simply speaking near the points of contact and when urgent support is needed. As of late May, the bulk of Russian losses is comprised out of dozen of Su-25 CAS aircraft and dozen of Su-34 bombers, both of which fly low and engage enemy within the visual range; four Su-30 multi-roles; also a lot of Ka-52 and Mi-24/Mi-28 helicopters which fly the same altitudes and do the same job. Russian losses to Ukrainian aircraft are nigh nonexistent. Russian losses to SAMs are minimal. The bulk of losses comes from MANPADs. Russia can’t launch country-wide SEAD but successfully destroys Ukrainian air-defenses in the operative depth, allowing CAS aircraft and helicopters to operate. But those are still vulnerable to MANPADs and you can’t really suppress them; this is very similar to Afghanistan where the majority of Soviet aircraft combat losses was suffered due to portable launchers.
Russia does not have much of the guided weapons or smart munitions either hence has to go for close to ground sorties which make them an easy kill with ground missiles which are now being supplied by the West. The lack of stand-off and guided munitions has restrict Russia to this type of warfare.. Combat footage routinely shows Russian aircraft flying off with unguided rocket pods or unguided bombs. Russian Army lacks the funds to procure enough of “smart munitions”. To give one a picture: Kh-29TD missile costs around 18 million of rubles, or around 250k of dollars at current rate. To load one Su-25 with four Kh-29 will cost a million dollars - per sortie. 9K121 “Vikhr” ATGM used on Ka-52 costs around 6 million of rubles in its simplest version - or around 85k of dollars. Russia could not afford such kind of spending. Hence this restricts Russia and exposes to ground missiles which the West now supplies.